Supporting structure frame of low-temperature storage tank suspended ceiling

Abstract

The invention discloses a supporting structure frame of a low-temperature storage tank suspended ceiling, which is integrally in an axial symmetry shape and comprises a central hole, a plurality of circles of annular main beams with different radiuses radiating outwards from the central hole, and radial secondary beams used for connecting the adjacent annular main beams and in a radial shape, and the adjacent annular main beams form an annular space; the radial secondary beams located in the same annular space are symmetrically distributed, and each ring of annular main beam is formed by connecting a plurality of arc-shaped beams formed through pre-bending. According to the supporting structure frame of the low-temperature storage tank suspended ceiling, welding work does not exist on a construction site, and the assembling cost and time are reduced.

Description

Technical Field

[0001] The present invention belongs to the field of cryogenic storage tank construction, and particularly relates to a support structure framework for the ceiling of a cryogenic storage tank. Background Art

[0002] As Figure 1 shown, a large cryogenic low-pressure liquefied gas storage tank (hereinafter referred to as a cryogenic storage tank) generally includes an outer tank and an inner tank disposed inside the outer tank. A ceiling is provided above the inner tank and is suspended from the steel arch roof of the outer tank. The ceiling includes a suspension device, a ceiling support structure framework, and ceiling decking. The ceiling support structure framework is the most important part of the ceiling.

[0003] Currently, there are two structures for the existing ceiling support structure framework of cryogenic storage tanks: 1) a plate welding structure strengthened by stiffeners; 2) a support framework connected by aluminum alloy profiles. Since the plate structure strengthened by stiffeners consumes a large amount of materials, has a high on-site construction difficulty, a long construction period, and high construction costs, the overall cost is high, and it is gradually being phased out. Another support framework only uses aluminum alloy materials. Since the strength and stiffness of aluminum alloy are much smaller than those of steel, and not all radial beams are continuous structures, only a few radial beams are continuous main beams, and it is not truly a complete axisymmetric structure in the real sense. Moreover, when this structure is in operation, the support framework is unevenly stressed and the deformation does not meet the standard requirements.

[0004] CN104533003A discloses a ceiling for a large storage tank, and its Figure 3 shows a schematic diagram of the ceiling grid structure. According to requirements, the grid 1 can be built into a planar shape, or it can be circular, elliptical, square, or irregular. The grid is built by multiple beams. The beams include radial beams and ring beams. The ring beams surround the center of the circular ceiling and are laid in an approximate circle with different radii; the radial beams take the ring beams as endpoints and are laid along the radius direction of the ceiling.

[0005] CN118031100A discloses a cold insulation structure for the ceiling of a cryogenic storage tank, which discloses that the ceiling framework includes multiple radial beams and multiple circumferential beams. The multiple radial beams are radially distributed around the same center, and each circumferential beam connects all the radial beams along the circumferential direction. The multiple circumferential beams are sequentially spaced apart from the inside to the outside along the center, and the cold insulation modules are laid on the grids formed by the intersection of the radial beams and the circumferential beams.

[0006] CN205026387U discloses a ceiling structure for a liquefied natural gas storage tank, including: a group of suspension rods, corrugated plates, and frame beams, and its Figure 6 shows a schematic diagram of the connection node of the frame beam. Rigid connection nodes are respectively arranged at the joints of the longitudinal beam and the ring beam of the frame beam and are connected together through node plates; the node plates and the beams are connected by welding. In addition, a bolt connection structure can be added to enhance the connection strength.

[0007] The support structure framework of the above ceiling generally adopts a welded structure, with high construction and installation costs, long construction periods, and high total costs for storage tanks. Summary of the Invention

[0008] In view of the problems existing in the prior art, the present invention provides a support structure framework for the ceiling of a cryogenic storage tank, which has uniform stress and high structural stability, can greatly reduce the material cost, construction and installation cost, and construction period of the ceiling, significantly reduce the total cost of the ceiling, and there is no welding work at the construction site.

[0009] The technical solution adopted by the present invention is as follows: A support structure framework for the ceiling of a cryogenic storage tank, which includes a central hole member, multiple rings of annular main beams with different radii radially spaced from the outer periphery of the central hole member, and a plurality of radial secondary beams for connecting the multiple rings of annular main beams and spaced circumferentially on the annular main beams. Among them, the radial secondary beams are discontinuous when passing through the annular main beams. The radial secondary beams are connected to the annular main beams through T-shaped connectors. The T-shaped connectors are arranged on both sides of the connection points between the radial secondary beams and the annular main beams on the annular main beams. The T-shaped connectors have two beam ribs. The radial secondary beams are inserted between the two beam ribs of the T-shaped connectors, and the T-shaped connectors are fixedly connected to the radial secondary beams through bolts and nuts, and the flange plates (or flanges) of the T-shaped connectors are fixedly connected to the annular main beams through bolts and nuts on both sides of the beam ribs of the T-shaped connectors. Each ring of annular main beams is formed by connecting multiple pre-bent bending members through U-shaped connectors or "「"-shaped connectors, bolts and nuts.

[0010] Further, the central hole member includes an outer cylinder and an inner cylinder arranged inside the outer cylinder. The tops of the outer cylinder and the inner cylinder are connected by an upper bottom plate, and the bottoms of the outer cylinder and the inner cylinder are connected by a lower bottom plate. The outer cylinder is connected to the innermost ring of annular main beams through a radial secondary beam. Generally, the outer diameter of the lower bottom plate is larger than the outer diameter of the upper bottom plate. The central hole member can be pre-welded from steel plates, for example. The diameter of the central hole is generally between 0.5 meters and 2.5 meters. The central hole member (1) connects the radial secondary beams together; (2) facilitates the passage of process nozzles or tooling for air-lifting roofs. In addition, the use of the central hole member can achieve an axisymmetric structure.

[0011] Further, the distance between adjacent circumferential main beams is generally between 1.5 meters and 3.5 meters, which is determined by the orientation of the tank top nozzles and the magnitude of the load. The diameter of the innermost ring of circumferential main beams is generally between 5 meters and 9 meters. The heights of the radial secondary beams and the circumferential main beams are generally between 100 - 200 mm, preferably 110 - 180 mm. The thicknesses of the upper and lower flange plates and the web are generally 6 - 12 mm, preferably 7 - 10 mm. The height of the web depends on the heights of the radial secondary beams and the circumferential main beams.

[0012] Further, two first radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member to the outermost ring main beam (preferably slightly exceeding the outermost ring main beam), and the two are in a straight line. Two second radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member to the second ring main beam from the inside out, and the two are in a straight line. The two first radial secondary beams and the two second radial secondary beams are perpendicular to each other. In the middle between adjacent first and second radial secondary beams, one third radial secondary beam extends from the outer periphery of the outer cylinder of the central hole member to the inside of the first ring main beam (closest to the central hole member), for a total of four third radial secondary beams. On both sides of the two first radial secondary beams in a straight line, four fourth radial secondary beams (a total of eight) extend evenly spaced along the outer periphery of the first ring main beam to the outermost ring main beam. Between the first ring main beam and the second ring main beam, one fifth radial secondary beam is provided respectively in the middle between the first radial secondary beam and the fourth radial secondary beam and in the middle between adjacent fourth radial secondary beams, for a total of 8 (no fifth radial secondary beam is provided where there is a second radial secondary beam in the middle of the fourth radial secondary beam). Between adjacent first and fourth radial secondary beams and between adjacent fourth radial beams, two sixth radial secondary beams extend evenly spaced from the outer periphery of the second ring main beam to the inside of the third ring main beam, for a total of 20 sixth radial secondary beams. Between adjacent first and fourth radial secondary beams and between adjacent fourth radial secondary beams, three seventh radial secondary beams extend evenly spaced from the outer periphery of the third ring main beam to the outermost ring main beam. The total number of rings of the main beam is 4 rings or 5 rings or more, such as 5 rings, 6 rings, 7 rings or 8 rings.

[0013] Further, the outer surface of the outer cylinder is provided with a plurality of lugs connected to the radial secondary beams, each having a slot for the web of the radial secondary beam to be inserted. The plurality of lugs are evenly spaced along the outer periphery of the outer cylinder, preferably 3 - 12 lugs are provided, more preferably 4 - 10 lugs, such as 8 lugs. Each lug may include two L-shaped plates arranged at intervals in opposite directions, with a slot, i.e., the first gap, in the middle. The L-shaped plate includes a horizontal plate and a vertical plate vertically connected to the horizontal plate. The vertical plates of the same lug are parallel to each other and form the first gap for the radial secondary beam to be inserted. Through holes are provided on the vertical plates for inserting bolts to fix the radial secondary beam.

[0014] Further, the cross-section of the bending member (i.e., the arc-shaped beam) is in the shape of an I-beam or a T-beam. The I-shaped bending member includes upper and lower flanges that are parallel to each other and a first web perpendicularly connected to the upper and lower flanges. The T-shaped bending member includes an upper flange and a first web. First through-holes are respectively formed at the end portions of the upper flange, the lower flange, and the first web for inserting bolts so as to connect two bending members together with a U-shaped connecting member or a "「"-shaped connecting member. A second through-hole is formed in the middle portion of the first web for inserting a bolt to fix a T-shaped connecting member. The material of the arc-shaped beam can be, for example, any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy. Depending on the size of the storage tank diameter, the bending radius of the arc-shaped beam can be, for example, 2 - 60 m.

[0015] Further, a plurality of bending members are sequentially connected into an annular main beam through U-shaped connecting members. Preferably, one U-shaped connecting member is provided on each side of the first web. The U-shaped connecting member includes a top plate and a bottom plate arranged in parallel and a side plate connected between the top plate and the bottom plate. The top plate and the bottom plate are respectively attached to the upper and lower flanges of the bending member, and the side plate is attached to the first web of the bending member. Third through-holes are respectively formed at the end portions of the top plate, the bottom plate, and the side plate. One part of the U-shaped connecting member coincides with the bending member on the left, and the other part of the U-shaped connecting member coincides with the bending member on the right. When the U-shaped connecting member coincides with the bending member, the first through-hole and the third through-hole are coaxial. After the bolt passes through the first through-hole and the third through-hole, it is screwed into a nut to realize the connection of the two bending members. A single-ring annular main beam can be formed by connecting, for example, 15 - 400 arc-shaped beams. The material of the U-shaped connecting member can be, for example, any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0016] Further, the radial secondary beams radially diverge outwardly at equal intervals along the outer periphery of the annular main beam. The cross-section of the radial secondary beam can be T-shaped or H-shaped. The T-shaped radial secondary beam includes a top flange and a second web perpendicularly connected to the top flange. The length of the top flange is less than the length of the second web. A fourth through-hole is formed at the end of the second web for inserting a bolt to fix it to the annular main beam with a T-shaped connecting member. A notch is formed at one end or both ends of the radial secondary beam. For example, the length of the notch is approximately half of the width of the upper or lower flange of the arc-shaped beam. The material of the radial secondary beam can be, for example, any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0017] Further, between adjacent annular main girders, both ends of the radial secondary girder are connected via a T-shaped connector between the outer side of one annular main girder with a smaller diameter and the inner side of one annular main girder with a larger diameter. The T-shaped connector includes a wing plate that fits against the first web and two beam ribs extending from the middle of the wing plate. Fifth through-holes are formed in the beam ribs, and sixth through-holes are formed in the wing plates on both sides of the beam ribs. A second gap for inserting the end of the radial secondary girder is formed between the two beam ribs. The end of the radial secondary girder provided with a notch is inserted into the second gap. The fourth through-hole corresponds (or is coaxial) to the fifth through-hole. After a bolt passes through the fourth through-hole and the fifth through-hole, it is screwed into a nut to realize the connection between the radial secondary girder and the T-shaped connector. Then, the wing plate of the T-shaped connector fits against the first web. The sixth through-hole corresponds (or is coaxial) to the second through-hole formed in the middle part of the first web. After a bolt passes through the sixth through-hole and the second through-hole, it is screwed into a nut to realize the connection between the radial secondary girder and the annular main girder. The material of the T-shaped member can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy, for example.

[0018] Further, between the central hole member and the innermost radial secondary girder, one end of the radial secondary girder is inserted into the first gap of the lug, and one end of the radial secondary girder is fixed in the first gap of the lug through a bolt. The other end of the radial secondary girder is connected to the annular main girder via a T-shaped connector. Preferably, no notch is provided at the end of the radial secondary girder inserted into the lug. The top wing plates on both sides of the second web respectively fit against the horizontal plate of the lug, and the second web simultaneously fits against the vertical plate of the lug. The first through-hole and the fourth through-hole correspond (or are coaxial). After a bolt passes through the first through-hole and the fourth through-hole, it is screwed into a nut to realize the connection between the radial secondary girder and the central hole member.

[0019] Further, in areas where local strengthening is required, strengthening members, i.e., diagonal beams, are added between adjacent radial secondary girders. The diagonal beams can be made of the same material as the radial secondary girders. The diagonal beams can be connected to the adjacent radial secondary girders via T-shaped connectors. The T-shaped connector includes a wing plate and two beam ribs extending from the middle of the wing plate. The wing plate of the T-shaped connector fits against the web (i.e., the second web) of the radial secondary girder and is fixed by bolts. The web of the diagonal beam is inserted into the gap between the two beam ribs of the T-shaped connector and is fixed by bolts. There are large manholes, process nozzles, etc. passing through the ceiling, and the local load is relatively large, so local strengthening is carried out. The number and position of the diagonal beams vary according to the size and number of nozzles in the project.

[0020] Advantages of the present invention: The support structure framework of the ceiling of a cryogenic storage tank provided by the present invention is a complete axisymmetric structure, which can prevent deformation during ceiling work and make the stress on each component more uniform. The radial secondary beams in the same annular space are symmetrically distributed, presenting overall symmetry both vertically and horizontally. The annular main beams are connected with equal strength, so the stress is more uniform. All the annular main beams are tightly connected by U-shaped connectors, bolts and nuts. The radial secondary beams and the annular main beams are connected by T-shaped connectors, bolts and nuts. The central hole and the radial secondary beams are connected through lugs, bolts and nuts, realizing no welding work at the construction site, thus greatly reducing the construction assembly cost and construction time and reducing the total cost of the ceiling. The materials of the central hole, the annular main beam, the radial secondary beam, the bolts and the nuts are any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel and aluminum alloy, meeting the requirements of the operating temperature of the products stored in various cryogenic storage tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the ceiling of a cryogenic storage tank.

[0022] Figure 2 It is an overall schematic diagram of the support structure framework of the ceiling of the cryogenic storage tank of the present application.

[0023] Figure 3 It is a plan view of the central hole, where Figure 3 (a) is a sectional view of the central hole component, and 3(b) is a top view of the central hole component.

[0024] Figure 4 It is a three-dimensional view of the central hole component.

[0025] Figure 5 It is a plan view of the connection between the lug and the radial secondary beam, where 5(a) is a front view of the connection between the lug and the radial secondary beam, 5(b) is a side view of the connection between the lug and the radial secondary beam, and 5(c) is a top view of the connection between the lug and the radial secondary beam.

[0026] Figure 6 It is a schematic structural diagram of the bending component.

[0027] Figure 7 It is a schematic structural diagram of the U-shaped connector.

[0028] Figure 8 It is a plan view of the connection between the left arc beam and the right arc beam, where Figure 8 (a) is a front sectional view of the connection between the left arc beam and the right arc beam, and 8(b) is a side sectional view of the connection between the left arc beam and the right arc beam.

[0029] Figure 9 It is a schematic structural diagram of the radial secondary beam.

[0030] Figure 10It is a schematic structural diagram of a T-shaped connector.

[0031] Figure 11 It is a plan view of the connection between the radial secondary beam and the annular main beam. Among them, 11(a) is the front view of the connection between the radial secondary beam and the annular main beam, and 11(b) is the top view of the connection between the radial secondary beam and the annular main beam.

[0032] Figure 12 It is a three-dimensional view of the connection between the radial secondary beam and the annular main beam.

[0033] Figure 13 It is a schematic structural diagram of the connection between the inclined beam and the radial secondary beam.

[0034] Reference numerals: A - inner tank, B - outer tank, C - suspension device, D - ceiling support structure frame and ceiling decking, 1 - central hole, 101 - outer cylinder, 102 - inner cylinder, 103 - upper bottom plate, 104 - lower bottom plate, 2 - annular main beam, 3 - radial secondary beam, 301 - top wing plate, 302 - second web, 303 - fourth through hole, 304 - notch, 4 - arc beam, 401 - upper wing plate, 402 - lower wing plate, 403 - first web, 404 - first through hole, 405 - second through hole, 5 - lug, 501 - horizontal plate, 502 - vertical plate, 503 - first gap, 504 - seventh through hole, 6 - U-shaped connector, 601 - top plate, 602 - bottom plate, 603 - side plate, 604 - third through hole, 7 - bolt, 8 - nut, 9 - T-shaped connector, 901 - wing plate, 902 - beam rib, 903 - fifth through hole, 904 - sixth through hole, 905 - second gap, 10 - inclined beam, 1001 - inclined beam web. Detailed implementation manners

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] As Figure 2-13As shown in the figure, a support structure framework for the ceiling of a low-temperature storage tank includes a central hole member 1, multiple rings of annular main beams 2 with different radii radially spaced from the outer periphery of the central hole member 1, and multiple radial secondary beams 3 for connecting the multiple rings of annular main beams 2 and spaced circumferentially on the annular main beams 2. Among them, the radial secondary beams 3 are discontinuous when passing through the annular main beams 2, and the radial secondary beams 3 are connected to the annular main beams 2 through T-shaped connectors 9. The T-shaped connectors 9 are arranged on both the inner and outer sides of the connection points between the radial secondary beams 3 on the annular main beams 2. The T-shaped connectors 9 have two beam ribs 902, and the radial secondary beams 3 are inserted between the two beam ribs 902 of the T-shaped connectors 9. The T-shaped connectors 9 are fixedly connected to the web of the radial secondary beams 3 through bolts 7 and nuts 8, and the flanges or wing plates 901 of the T-shaped connectors 9 are fixedly connected to the web of the annular main beams 2 through bolts 7 and nuts 8 on both sides of the beam ribs of the T-shaped connectors 9. Each ring of annular main beams 2 is formed by connecting multiple pre-bent curved members 4 through U-shaped connectors (or "「" - shaped connectors) 6, bolts 7, and nuts 8. The flanges or wing plates 901 of the T-shaped connectors 9 are flat or preferably have a curvature matching the web of the annular main beams 2 connected thereto. For example, the inner side of the annular main beam 2 has a curvature with a slightly protruding middle part, and the outer side of the annular main beam 2 has a curvature with a slightly concave middle part.

[0037] The central hole member 1 includes an outer cylinder 101 and an inner cylinder 102 arranged inside the outer cylinder 101. The tops of the outer cylinder 101 and the inner cylinder 102 are connected by an upper bottom plate 103, and the bottoms of the outer cylinder 101 and the inner cylinder 102 are connected by a lower bottom plate 104. The outer cylinder 101 is connected to the innermost annular main beam 2 through a radial secondary beam 3. The central hole 1 can be pre-welded from steel plates, for example. The upper bottom plate 103 and the lower bottom plate 104 are annular. Generally, the outer diameter of the lower bottom plate is larger than the outer diameter of the upper bottom plate. The diameter of the central hole is generally between 0.5 meters and 2.5 meters. The use of the central hole structure can achieve an axisymmetric structure.

[0038] The outer surface of the outer cylinder 101 is provided with multiple lugs 5 connected to the radial secondary beams 3. Each lug 5 has a gap for the web of the radial secondary beam 3 to be embedded. Preferably, 3 - 12 lugs are provided, more preferably 4 - 10 lugs, such as 5, 6, 7, or 8 lugs 5. Each lug 5 may include two L-shaped plates arranged at intervals in opposite directions, with a first gap 503 in the middle. The L-shaped plates include a horizontal plate 501 and a vertical plate 502 perpendicularly connected to the horizontal plate. The vertical plates of the same lug are parallel to each other and form a first gap for the radial secondary beam to be inserted. The vertical plate 502 is provided with a seventh through hole 504 for passing through bolts to fix the radial secondary beam 3.

[0039] The spacing between adjacent circumferential main beams is generally between 1.5 meters and 3.5 meters, which is determined by the orientation of the tank top nozzles and the magnitude of the load. The diameter of the innermost circumferential main beam is generally between 5 meters and 9 meters. The height of the radial secondary beams and the circumferential main beams is generally between 100 - 200 mm, preferably 110 - 180 mm. The thickness of the upper and lower flange plates and the web is generally 6 - 12 mm, preferably 7 - 10 mm, and the height of the web depends on the height of the radial secondary beams and the circumferential main beams.

[0040] In a preferred embodiment, as Figure 2 shown, the radial secondary beams are arranged as follows: Two first radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member 1 to the outermost ring main beam (preferably slightly exceeding the outermost ring main beam), and the two are in a straight line. Two second radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member to the second ring main beam from the inside out, and the two are in a straight line. The two first radial secondary beams and the two second radial secondary beams are perpendicular to each other. In the middle between adjacent first radial secondary beams and second radial secondary beams, one third radial secondary beam extends from the outer periphery of the outer cylinder of the central hole member to the inside of the first ring main beam (the one closest to the central hole member), for a total of four third radial secondary beams. On both sides of the two first radial secondary beams in a straight line, four fourth radial secondary beams (a total of eight) extend evenly spaced along the outer periphery of the first ring main beam to the outermost ring main beam. Between the first ring main beam and the second ring main beam, one fifth radial secondary beam is provided in the middle between the first radial secondary beam and the fourth radial secondary beam and in the middle between adjacent fourth radial secondary beams, for a total of 8 (no fifth radial secondary beam is provided where there is a second radial secondary beam in the middle of the fourth radial secondary beam). Between adjacent first radial secondary beams and fourth radial secondary beams and between adjacent fourth radial beams, two sixth radial secondary beams extend evenly spaced from the outer periphery of the second ring main beam to the inside of the third ring main beam, for a total of 20 sixth radial secondary beams. Between adjacent first radial secondary beams and fourth radial secondary beams and between adjacent fourth radial secondary beams, three seventh radial secondary beams extend evenly spaced from the outer periphery of the third ring main beam to the outermost ring main beam. The total number of rings of the ring main beam 2 is 4 rings or 5 rings or more, such as 5 rings, 6 rings, 7 rings or 8 rings.

[0041] The cross-section of the bending member (arc-shaped beam) 4 can be in the shape of an I-beam (or H-beam) or a T-beam. The I-shaped bending member 4 includes parallel upper and lower flanges 401 and 402, and a first web 403 perpendicularly connected to the upper and lower flanges 401 and 402. The T-shaped bending member 4 includes an upper flange 401 and a first web 403. The ends of the upper flange 401, lower flange 402, and first web 403 are respectively provided with first through holes 404 for inserting bolts so as to connect two bending members 4 together with a U-shaped connecting member or a "「"-shaped connecting member. Second through holes 405 (generally two arranged at intervals) are provided in the middle part of the first web 403 for inserting bolts to fix the T-shaped connecting member 9. The material of the bending member 4 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy. Depending on the size of the storage tank diameter, the bending radius of the bending member 4 can be, for example, 2 - 60 m.

[0042] In one embodiment, a plurality of bending members 4 are sequentially connected into an annular main beam 2 through U-shaped connecting members 6. Preferably, a U-shaped connecting member 6 is provided on each side of the first web 403. The U-shaped connecting member 6 includes a top plate 601 and a bottom plate 602 arranged in parallel and a side plate 603 connected between the top plate 601 and the bottom plate 602. The top plate 601 and the bottom plate 602 are respectively attached to the upper and lower flanges 401 and 402 of the bending member 4, and the side plate 603 is attached to the first web 403 of the arc-shaped beam 4. Third through holes 604 are respectively provided at the ends of the top plate 601, bottom plate 602, and side plate 603. One part of the U-shaped connecting member 6 coincides with the left bending member 4, and the other part of the U-shaped connecting member 6 coincides with the right bending member 4. When the U-shaped connecting member 6 coincides with the bending member 4, the first through hole 404 and the third through hole 604 are corresponding or coaxial. After the bolt 7 passes through the first through hole 404 and the third through hole 604 and is screwed into the nut 8, the connection of the two bending members 4 is realized. A single-ring annular main beam 2 can be formed by connecting, for example, 15 - 400 bending members 4. The material of the U-shaped connecting member 6 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0043] The radial secondary beam 3 diverges outward along the outer periphery of the annular main beam 2. The cross-section of the radial secondary beam 3 can be T-shaped, including a top flange 301 and a second web 302 perpendicularly connected to the top flange 301. The length of the top flange 301 is less than the length of the second web 302. A fourth through hole 303 is provided at the end of the second web 302 for inserting a bolt to fix it to the annular main beam 2 with a T-shaped connecting member 9. A notch 304 is formed at one or both ends of the radial secondary beam 3. The length of the notch 304 can be approximately half of the width of the upper flange 401 or the lower flange 402 of the arc-shaped beam 4. The material of the radial secondary beam 3 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0044] Between adjacent annular main beams, the radial secondary beam 3 is connected to the annular main beam 2 via a T-shaped connector 9. The T-shaped connector 9 includes a wing plate 901 that fits against the first web 403 and two beam ribs 902 that extend from the middle of the wing plate 901. A fifth through-hole 903 is formed in the beam ribs 902, and sixth through-holes 904 are formed in the wing plate 901 on both sides of the beam ribs 902. A second gap 905 for inserting the end of the radial secondary beam 3 is formed between the two beam ribs 902. One end of the radial secondary beam 3 provided with a notch 304 is inserted into the second gap 905. The fourth through-hole 303 corresponds to or is coaxial with the fifth through-hole 903. A bolt 7 passes through the fourth through-hole 303 and the fifth through-hole 903 and then is screwed into a nut 8 to realize the connection between the radial secondary beam 3 and the T-shaped connector 9. Then, the wing plate 901 of the T-shaped connector 9 fits against the first web 403. The sixth through-hole 904 is coaxial with a second through-hole 405 formed in the middle part of the first web 403. A bolt 7 passes through the sixth through-hole 904 and the second through-hole 405 and then is screwed into a nut 8 to realize the connection between the radial secondary beam 3 and the annular main beam 2. The material of the T-shaped connector 9 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy, for example.

[0045] Between the central hole member 1 and the innermost radial secondary beam 3, one end of the radial secondary beam 3 is inserted into the first gap 503 of the lug 5, and one end of the radial secondary beam is fixed in the first gap of the lug 5 through a bolt 7. The other end of the radial secondary beam 3 is connected to the annular main beam 2 via a T-shaped connector 9. Preferably, no notch 304 is provided at the end of the radial secondary beam 3 inserted into the lug. The top wing plates 301 on both sides of the second web 302 are respectively in contact with the horizontal plate 501 of the lug 5, and the second web 302 is in contact with the vertical plates 502 of the two lugs 5 at the same time. The seventh through-hole 504 corresponds to or is coaxial with the fourth through-hole 303. A bolt 7 passes through the seventh through-hole 504 and the fourth through-hole 303 and then is screwed into a nut 8 to realize the connection between the radial secondary beam 3 and the central hole member 1.

[0046] In another preferred embodiment, as Figure 13 shown, in areas where local strengthening is required (such as areas where large manholes, process nozzles, etc. pass through on the ceiling), strengthening members, i.e., diagonal beams 10, are added between adjacent radial secondary beams 3. The diagonal beams 10 can be made of the same material as the radial secondary beams. The diagonal beams 10 can be connected to the adjacent radial secondary beams 3 via T-shaped connectors 9. The T-shaped connector 9 includes a wing plate and two beam ribs that extend from the middle of the wing plate. The wing plate of the T-shaped connector 9 fits against the web (i.e., the second web) of the radial secondary beam 3 and is fixed by bolts and nuts. The web 1001 of the diagonal beam is inserted into the gap between the two beam ribs of the T-shaped connector and is fixed by bolts and nuts. The number and position of the diagonal beams 10 vary according to the size and number of nozzles in the project.

[0047] The materials of the bolt 7 and the nut 8 can be, for example, any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy. Example 1

[0048] A support structure framework for the ceiling of a low-temperature storage tank, which includes a central hole member 1, multiple rings of annular main beams 2 with different radii radially spaced from the outer periphery of the central hole member 1, and a plurality of radial secondary beams 3 for connecting the multiple rings of annular main beams 2 and spaced circumferentially on the annular main beams 2. Among them, the radial secondary beams 3 are discontinuous when passing through the annular main beams 2. The radial secondary beams 3 are connected to the annular main beams 2 through T-shaped connectors 9. The T-shaped connectors 9 are arranged on both the inner and outer sides of the connection points between the radial secondary beams 3 on the annular main beams 2. The T-shaped connectors 9 have two beam ribs 902. The radial secondary beams 3 are inserted between the two beam ribs 902 of the T-shaped connectors 9. The T-shaped connectors 9 and the radial secondary beams 3 are fixedly connected by bolts and nuts, and the flange or wing plate 901 of the T-shaped connectors 9 and the annular main beams 2 are fixedly connected by bolts 7 and nuts 8 on both sides of the beam ribs of the T-shaped connectors 9. Each ring of annular main beams 2 is formed by connecting a plurality of pre-bent bending members 4 through U-shaped connectors 6, bolts 7, and nuts 8.

[0049] The central hole member 1 includes an outer cylinder 101 and an inner cylinder 102 arranged inside the outer cylinder 101. The tops of the outer cylinder 101 and the inner cylinder 102 are connected by an upper bottom plate 103, and the bottoms of the outer cylinder 101 and the inner cylinder 102 are connected by a lower bottom plate 104. The outer cylinder 101 and the innermost ring of annular main beams 2 are connected by a radial secondary beam 3. The central hole 1 is pre-welded by steel plates, and the upper bottom plate 103 and the lower bottom plate 104 are annular.

[0050] Eight lugs 5 connected to the radial secondary beams 3 are provided on the outer surface of the outer cylinder 101. Each lug 5 has a gap for the web of the radial secondary beam 3 to be embedded.

[0051] The configuration of the radial secondary beams is as Figure 2 shown. There are a total of 5 rings of annular main beams.

[0052] According to the present application, the ceiling support structure framework is a complete axisymmetric structure, which can prevent deformation during ceiling work and make the stress of each component more uniform. At the same time, since the radial secondary beams are connected to the annular main beams through T-shaped connectors, and each ring of annular main beams is formed by connecting a plurality of pre-bent bending members through U-shaped connectors, the material cost, construction and installation cost, and construction period of the ceiling are greatly reduced, making the total cost of the ceiling significantly reduced. Example 2

[0053] Same as Example 1, except that in the areas where local strengthening is required, strengthening members, i.e., diagonal beams 10, are added between adjacent radial secondary beams 3. The diagonal beams 10 are connected to the adjacent radial secondary beams 3 through T-shaped connectors 9. The T-shaped connector 9 includes a wing plate and two beam ribs extending from the middle of the wing plate. The wing plate of the T-shaped connector 9 abuts against the web (i.e., the second web) of the radial secondary beam 3 and is fixed by bolts and nuts. The web 1001 of the diagonal beam is inserted into the gap between the two beam ribs of the T-shaped connector and is fixed by bolts and nuts. Comparative Example 1

[0054] For the ceiling of a cryogenic liquefied gas storage tank, a plate-welded structure strengthened with stiffeners is adopted. Since the plate structure strengthened with stiffeners consumes a large amount of materials, the on-site construction is difficult, the construction period is long, and the construction cost is high, resulting in a high overall cost. Comparative Example 2

[0055] For the ceiling of a cryogenic liquefied gas storage tank, a support frame connected by aluminum alloy profiles is adopted. This support frame only uses aluminum alloy materials, and part of the welded structure is completed in the factory. Since the strength of the heat-affected zone of the aluminum alloy profile welding decreases significantly, and not all radial beams are continuous structures. Only some radial beams are continuous main beams, not a truly complete axisymmetric structure in the real sense. Moreover, the stress intensity and deformation of this structure during the operation of the ceiling or under extreme conditions do not meet the standard requirements.

[0056] The preferred embodiments of the present invention have been described above. However, the above description is not for the purpose of limitation. Those of ordinary skill in the art can make many changes or modifications to the present invention without departing from the gist and scope of the present invention. Such changes or modifications should be included within the scope of the appended claims.

Claims

1. A support structure framework for the ceiling of a low-temperature storage tank, characterized in that, It includes a central hole member (1), multiple rings of annular main beams (2) with different radii radially spaced from the outer periphery of the central hole member (1), and multiple radial secondary beams (3) for connecting the multiple rings of annular main beams (2) and spaced circumferentially on the annular main beams (2). Among them, the radial secondary beam (3) is discontinuous when passing through the annular main beam (2). The radial secondary beam (3) is connected to the annular main beam (2) through a T-shaped connector (9). The T-shaped connector (9) is arranged on both sides of the connection point between the radial secondary beam (3) and the annular main beam (2) on the annular main beam (2). The T-shaped connector (9) has two beam ribs. The radial secondary beam (3) is inserted between the two beam ribs of the T-shaped connector (9). The T-shaped connector (9) and the radial secondary beam (3) are fixedly connected by bolts and nuts. And the flange or wing plate of the T-shaped connector (9) and the annular main beam (2) are fixedly connected by bolts (7) and nuts (8) on both sides of the beam ribs of the T-shaped connector (9). Each ring of annular main beam (2) is formed by connecting multiple pre-bent bending members (4) through U-shaped connectors or "「”-shaped connectors (6), bolts (7) and nuts (8).

2. The support structure framework according to claim 1, characterized in that, The central hole member (1) includes an outer cylinder (101) and an inner cylinder (102) arranged inside the outer cylinder (101). The tops of the outer cylinder (101) and the inner cylinder (102) are connected by an upper bottom plate (103). The bottoms of the outer cylinder (101) and the inner cylinder (102) are connected by a lower bottom plate (104). The outer cylinder (101) and the innermost ring of annular main beam (2) are connected by a radial secondary beam (3).

3. The support structure framework according to claim 2, wherein A plurality of lugs (5) connected to the radial secondary beam (3) are provided on the outer surface of the outer cylinder (101). Each lug (5) has a first gap (503) for the web of the radial secondary beam (3) to be embedded in.

4. The support structure framework according to claim 1, characterized in that, The cross-section of the bending member (4) is in the shape of an I-beam or a T-beam. The I-shaped bending member (4) includes parallel upper and lower wing plates (401, 402) and a first web (403) perpendicularly connected to the upper and lower wing plates (401, 402). The T-shaped bending member (4) includes an upper wing plate (401) and a first web (403). First through holes (404) are respectively opened at the ends of the upper wing plate (401), the lower wing plate (402) and the first web (403) for inserting bolts so as to connect two bending members (4) together with a U-shaped connector or a "「”-shaped connector. A second through hole (405) is opened in the middle part of the first web (403) for inserting bolts to fix the T-shaped connector (9).

5. The support structure frame according to claim 4, characterized in that, A plurality of bending members (4) are sequentially connected by U-shaped connectors (6) to form an annular main beam (2). A U-shaped connector (6) is provided on each side of the first web (403). The U-shaped connector (6) includes a top plate (601) and a bottom plate (602) arranged in parallel and side plates (603) connecting the top plate (601) and the bottom plate (602). The top plate (601) and the bottom plate (602) are respectively in contact with the upper flange (401) and the lower flange (402) of the bending member (4), and the side plates (603) are in contact with the first web (403) of the bending member (4). Third through holes (604) are respectively formed at the end portions of the top plate (601), the bottom plate (602) and the side plates (603). A part of the U-shaped connector (6) coincides with the bending member (4) on the left, and another part of the U-shaped connector (6) coincides with the bending member (4) on the right. The first through hole (404) corresponds to the third through hole (604). After the bolt (7) passes through the first through hole (404) and the third through hole (604), it is screwed into the nut (8) to realize the connection of the two bending members (4).

6. The support structure framework according to claim 1, characterized in that The radial secondary beams (3) radially diverge outward along the outer periphery of the annular main beam (2). The cross-section of the radial secondary beam (3) is T-shaped, including a top flange (301) and a second web (302) vertically connected to the top flange (301). The length of the top flange (301) is less than the length of the second web (302). A fourth through hole (303) is formed at the end of the second web (302) for inserting a bolt, and it is fixed to the annular main beam (2) by a T-shaped connector (9). Notches (304) are formed at one end or both ends of the radial secondary beam (3).

7. The support structure framework according to claim 6, characterized in that, Between adjacent annular main beams, the radial secondary beam (3) and the annular main beam (2) are connected by a T-shaped connector (9). The T-shaped connector (9) includes a wing plate (901) in contact with the first web (403) and two beam ribs (902) extending from the middle of the wing plate (901). Fifth through holes (903) are formed in the beam ribs (902), and sixth through holes (904) are formed in the wing plates (901) on both sides of the beam ribs (902). A second gap (905) for inserting the end of the radial secondary beam (3) is formed between the two beam rib plates (902). The end of the radial secondary beam (3) provided with the notch (304) is inserted into the second gap (905). The fourth through hole (303) corresponds to the fifth through hole (903). After the bolt (7) passes through the fourth through hole (303) and the fifth through hole (903), it is screwed into the nut (8) to realize the connection of the radial secondary beam (3) and the T-shaped connector (9). The wing plate (901) of the T-shaped connector (9) is in contact with the first web (403). The sixth through hole (904) corresponds to the second through hole (405) formed in the middle part of the first web (403). After the bolt (7) passes through the sixth through hole (904) and the second through hole (405), it is screwed into the nut (8) to realize the connection of the radial secondary beam (3) and the annular main beam (2).

8. The support structure framework according to claim 7, wherein, Between the central hole member (1) and the innermost radial secondary beam (3), one end of the radial secondary beam (3) is inserted into the gap of the lug (5), and one end of the radial secondary beam is fixed in the first gap (503) of the lug (5) by bolts. The other end of the radial secondary beam is connected to the annular main beam (2) through a T-shaped connector (9).

9. The support structure framework according to any one of claims 1-8, characterized in that, The radial secondary beams are arranged as follows: Two first radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member (1) to the outermost annular main beam, and the two are in a straight line. Two second radial secondary beams extend from the outer periphery of the outer cylinder of the central hole member to the second annular main beam from the inside out, and the two are in a straight line. The two first radial secondary beams and the two second radial secondary beams are perpendicular to each other. In the middle between the adjacent first and second radial secondary beams, one third radial secondary beam extends from the outer periphery of the outer cylinder of the central hole member to the inside of the first annular main beam respectively. On both sides of the two first radial secondary beams in a straight line, four fourth radial secondary beams extend evenly spaced along the outer periphery of the first annular main beam to the outermost annular main beam. Between the first and second annular main beams, one fifth radial secondary beam is provided respectively in the middle between the first and fourth radial secondary beams and in the middle between the adjacent fourth radial secondary beams. Between the first and fourth radial secondary beams and between the adjacent fourth radial beams, two sixth radial secondary beams extend evenly spaced from the outer periphery of the second annular main beam to the inside of the third annular main beam respectively. Between the first and fourth radial secondary beams and between the adjacent fourth radial secondary beams, three seventh radial secondary beams extend evenly spaced from the outer periphery of the third annular main beam to the outermost annular main beam respectively.

10. The support structure framework according to any one of claims 1-9, characterized in that In the area where local strengthening is required, a diagonal beam (10) is connected between the adjacent radial secondary beams (3). The diagonal beam (10) is connected to the adjacent radial secondary beam (3) through a T-shaped connector (9). The T-shaped connector (9) includes a wing plate and two beam ribs extending from the middle of the wing plate. The wing plate of the T-shaped connector (9) fits against the web of the radial secondary beam (3) and is fixed by bolts and nuts. The web (1001) of the diagonal beam is inserted into the gap between the two beam ribs of the T-shaped connector (9) and is fixed by bolts and nuts.

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