Supporting structure frame of low-temperature storage tank suspended ceiling

Abstract

The utility model 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 utility model 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 Technique

[0002] As Figure 1 shown, a large-scale cryogenic low-pressure liquefied gas storage tank (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 a ceiling deck. The ceiling support structure framework is the most important part of the ceiling.

[0003] At present, 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 great difficulty in on-site construction, 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. It is not really a complete axisymmetric structure. Moreover, when this structure is working on the ceiling, 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 needs, 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 a plurality of radial beams and a plurality of circumferential beams. The plurality of radial beams are radially distributed around the same center, and each circumferential beam connects all the radial beams along the circumference. The plurality of 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, a corrugated plate, and a frame beam, and its Figure 6The schematic diagram of the connection node of the frame beam is shown. 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 the node plate; the node plate is connected with the beam by welding. In addition, in order to strengthen the connection strength, a bolt connection structure can be additionally provided.

[0007] Generally, the support structure frame of the above ceiling is of welded structure, with high construction and installation costs, long construction period, and high total cost of the storage tank. Utility Model Content

[0008] Aiming at the problems existing in the prior art, the utility model provides a support structure frame 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 utility model is as follows:

[0010] A support structure frame 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 multiple radial secondary beams used to connect the multiple rings of annular main beams and spaced circumferentially on the annular main beams.

[0011] Among them, the radial secondary beam is discontinuous when passing through the annular main beam. The radial secondary beam is connected to the annular main beam through a T-shaped connecting piece. The T-shaped connecting piece is arranged on both sides of the connection point between the radial secondary beam and the annular main beam on the annular main beam. The T-shaped connecting piece has two beam ribs. The radial secondary beam is inserted between the two beam ribs of the T-shaped connecting piece, and the T-shaped connecting piece is fixedly connected to the radial secondary beam through bolts and nuts, and the flange (or flange) of the T-shaped connecting piece is fixedly connected to the annular main beam through bolts and nuts on both sides of the beam rib of the T-shaped connecting piece.

[0012] Each ring of annular main beam is composed of multiple pre-bent bending members connected by U-shaped connecting pieces or "「" - shaped connecting pieces, bolts and nuts.

[0013] Furthermore, the central hole member includes an outer cylinder body and an inner cylinder body arranged inside the outer cylinder body. The tops of the outer cylinder body and the inner cylinder body are connected by an upper bottom plate, the bottoms of the outer cylinder body and the inner cylinder body are connected by a lower bottom plate, and the outer cylinder body is connected to the innermost ring of annular main beam 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 passing of process nozzles or the tooling of the air-lift roof. In addition, the use of the central hole member can achieve an axisymmetric structure.

[0014] Furthermore, the spacing between adjacent circumferential main girders 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 girder is generally between 5 meters and 9 meters. The height of the radial secondary girders and the circumferential main girders 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 girders and the circumferential main girders.

[0015] Furthermore, two first radial secondary girders extend from the outer periphery of the outer cylinder of the central hole member to the outermost ring-shaped main girder (preferably slightly exceeding the outermost ring-shaped main girder), and the two are in a straight line. Two second radial secondary girders extend from the outer periphery of the outer cylinder of the central hole member to the second ring-shaped main girder from the inside out, and the two are in a straight line. The two first radial secondary girders and the two second radial secondary girders are perpendicular to each other.

[0016] In the middle between the adjacent first radial secondary girders and the second radial secondary girders, one third radial secondary girder extends from the outer periphery of the outer cylinder of the central hole member to the inside of the first ring-shaped main girder (the one closest to the central hole member) respectively, for a total of four third radial secondary girders.

[0017] On both sides of the two first radial secondary girders that are in a straight line, four fourth radial secondary girders (a total of eight) extend evenly spaced along the outer periphery of the first ring-shaped main girder to the outermost ring-shaped main girder.

[0018] Between the first ring-shaped main girder and the second ring-shaped main girder, one fifth radial secondary girder is provided respectively in the middle between the first radial secondary girder and the fourth radial secondary girder and in the middle between the adjacent fourth radial secondary girders, for a total of 8 (no fifth radial secondary girder is provided where there is a second radial secondary girder in the middle of the fourth radial secondary girders).

[0019] Between the adjacent first radial secondary girders and the fourth radial secondary girders and between the adjacent fourth radial girders, two sixth radial secondary girders extend evenly spaced from the outer periphery of the second ring-shaped main girder to the inside of the third ring-shaped main girder respectively, for a total of 20 sixth radial secondary girders.

[0020] Between the adjacent first radial secondary girders and the fourth radial secondary girders and between the adjacent fourth radial secondary girders, three seventh radial secondary girders extend evenly spaced from the outer periphery of the third ring-shaped main girder to the outermost ring-shaped main girder. The total number of rings of the ring-shaped main girder is 4 rings or 5 rings or more, such as 5 rings, 6 rings, 7 rings or 8 rings.

[0021] Further, the outer surface of the outer cylinder is provided with a plurality of lugs connected to the radial secondary beams, and each lug has a slot for the web of the radial secondary beam to be inserted into. The plurality of lugs are evenly spaced along the circumference 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, formed in the middle. The L-shaped plate includes a horizontal plate and a vertical plate perpendicularly 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 into. Through holes are formed in the vertical plates for bolts to pass through to fix the radial secondary beam.

[0022] Further, the cross-section of the bending member (i.e., the arc beam) is in the shape of an I-beam or a T-beam. The I-shaped bending member includes a top flange and a bottom flange that are parallel to each other, and a first web perpendicularly connected to the top flange and the bottom flange. The T-shaped bending member includes a top flange and a first web. First through holes are respectively formed at the end portions of the top flange, the bottom flange, and the first web for bolts to be inserted so as to connect two bending members together with a U-shaped connecting member or a "「"-shaped connecting member. Second through holes are formed in the middle portion of the first web for bolts to be inserted to fix the T-shaped connecting member. The material of the arc 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 beam can be, for example, 2 - 60 m.

[0023] Further, a plurality of bending members are sequentially connected into a circular main beam through U-shaped connecting members. Preferably, a 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 top flange and the bottom flange 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 left bending member, and the other part of the U-shaped connecting member coincides with the right bending member. When the U-shaped connecting member coincides with the bending member, the first through hole and the third through hole are coaxial. The bolts pass through the first through hole and the third through hole and are then screwed into nuts to realize the connection of the two bending members. A single circle of circular main beam can be formed by connecting, for example, 15 - 400 arc 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.

[0024] Furthermore, the radial secondary beams radially diverge outwardly at uniform 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 that of the second web. A fourth through-hole is formed at the end of the second web for inserting a bolt, and it is fixed to the annular main beam with a T-shaped connector. Notches are formed at one 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 curved beam. The material of the radial secondary beam can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0025] Furthermore, between adjacent annular main beams, the two ends of the radial secondary beam are respectively connected by a T-shaped connector between the outer side of a smaller-diameter annular main beam and the inner side of a larger-diameter annular main beam. The T-shaped connector includes a flange that fits against the first web and two beam ribs extending from the middle of the flange. Fifth through-holes are formed in the beam ribs, and sixth through-holes are formed in the flanges on both sides of the beam ribs. A second gap for inserting the end of the radial secondary beam is formed between the two beam ribs. The end of the radial secondary beam with the notch is inserted into the second gap. The fourth through-hole corresponds (or is coaxial) to the fifth through-hole. After the bolt passes through the fourth through-hole and the fifth through-hole, it is screwed into a nut to achieve the connection between the radial secondary beam and the T-shaped connector. Then, the flange 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 the bolt passes through the sixth through-hole and the second through-hole, it is screwed into a nut to achieve the connection between the radial secondary beam and the annular main beam. The material of the T-shaped part can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy.

[0026] Furthermore, between the central hole member and the innermost radial secondary beam, one end of the radial secondary beam is inserted into the first gap of the lug, and one end of the radial secondary beam is fixed in the first gap of the lug through a bolt. The other end of the radial secondary beam is connected to the annular main beam through a T-shaped connector. Preferably, no notch is provided at the end of the radial secondary beam inserted into the lug. The top flanges on both sides of the second web are respectively in contact with the horizontal plate of the lug, and the second web is simultaneously in contact with the vertical plate of the lug. The first through-hole and the fourth through-hole correspond (or are coaxial). After the bolt passes through the first through-hole and the fourth through-hole, it is screwed into a nut to achieve the connection between the radial secondary beam and the central hole member.

[0027] Further, in the areas where local strengthening is required, strengthening members, i.e., diagonal beams, are added between adjacent radial secondary beams. The diagonal beams can be made of the same material as the radial secondary beams. The diagonal beams can be connected to the adjacent radial secondary beams through 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 beam 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.

[0028] Advantages of the present utility model:

[0029] The support structure framework of the ceiling of a cryogenic storage tank provided by the present utility model is a complete axisymmetric structure, which can prevent deformation during the operation of the ceiling and make the stress of each component more uniform. The radial secondary beams in the same annular space are symmetrically distributed, presenting overall up-down symmetry and left-right symmetry. 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. Description of the drawings

[0030] Figure 1 It is a schematic diagram of the ceiling of a cryogenic storage tank.

[0031] 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.

[0032] Figure 3 It is a plan view of the central hole. Among them, Figure 3 (a) is a sectional view of the central hole component, and 3(b) is a top view of the central hole component.

[0033] Figure 4 It is a three-dimensional view of the central hole component.

[0034] Figure 5 It is a plan view of the connection between the lug and the radial secondary beam. Among them, 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.

[0035] Figure 6 Schematic structural diagram of a bending member.

[0036] Figure 7 Schematic structural diagram of a U-shaped connecting member.

[0037] Figure 8 Plan view of the connection between the left arc beam and the right arc beam, where Figure 8 (a) is the front sectional view of the connection between the left arc beam and the right arc beam, and 8(b) is the side sectional view of the connection between the left arc beam and the right arc beam.

[0038] Figure 9 Schematic structural diagram of a radial secondary beam.

[0039] Figure 10 Schematic structural diagram of a T-shaped connecting member.

[0040] Figure 11 Plan view of the connection between the radial secondary beam and the annular main beam, where 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.

[0041] Figure 12 Stereogram of the connection between the radial secondary beam and the annular main beam.

[0042] Figure 13 Schematic structural diagram of the connection between the inclined beam and the radial secondary beam.

[0043] Reference numerals:

[0044] A - Inner tank, B - Outer tank, C - Suspension device, D - Ceiling support structure frame and ceiling deck

[0045] 1 - Central hole, 101 - Outer cylinder, 102 - Inner cylinder, 103 - Upper bottom plate, 104 - Lower bottom plate

[0046] 2 - Annular main beam

[0047] 3 - Radial secondary beam, 301 - Top wing plate, 302 - Second web, 303 - Fourth through hole, 304 - Notch

[0048] 4 - Arc beam, 401 - Upper wing plate, 402 - Lower wing plate, 403 - First web, 404 - First through hole, 405 - Second through hole

[0049] 5 - Ear, 501 - Horizontal plate, 502 - Vertical plate, 503 - First gap, 504 - Seventh through hole

[0050] 6 - U-shaped connecting member, 601 - Top plate, 602 - Bottom plate, 603 - Side plate, 604 - Third through hole

[0051] 7 - Bolt

[0052] 8 - Nut

[0053] 9 - T - shaped connector, 901 - wing plate, 902 - beam rib, 903 - fifth through - hole, 904 - sixth through - hole, 905 - second gap

[0054] 10 - Inclined beam, 1001 - inclined beam web Detailed implementation mode

[0055] The present utility model will be further described below with reference to the accompanying drawings.

[0056] As Figure 2-13 shown, a support structure framework for the ceiling of a cryogenic 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 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, 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. 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 webs of the radial secondary beams 3 are fixedly connected by bolts 7 and nuts 8, and the flanges or wing plates 901 of the T - shaped connectors 9 and the webs of 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 (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 beam 2 to which they are connected. For example, the wing plates located inside the annular main beam 2 have a curvature with a middle protruding outward, and the wing plates located outside the annular main beam 2 have a curvature with a middle concave inward.

[0057] 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 radial secondary beams 3. The central hole 1 can be pre - welded by 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. Adopting the central hole structure can achieve an axisymmetric structure.

[0058] The outer surface of the outer cylinder 101 is provided with a plurality of 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 inserted. 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 therebetween. The L-shaped plate includes 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. A seventh through hole 504 is formed in the vertical plate 502 for inserting bolts to fix the radial secondary beam 3.

[0059] 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 beam and the circumferential main beam 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. The height of the web depends on the height of the radial secondary beam and the circumferential main beam.

[0060] In a preferred embodiment, as Figure 2 shown, the radial secondary beams are configured as follows:

[0061] 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.

[0062] 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 (the one closest to the central hole member), for a total of four third radial secondary beams.

[0063] 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.

[0064] 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 and fourth radial secondary beams 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 beams).

[0065] Between the adjacent first radial secondary beam and the fourth radial secondary beam and between the adjacent fourth radial beams, two sixth radial secondary beams are respectively and evenly spaced from the outer periphery of the second ring-shaped main beam and extend to the inner side of the third ring-shaped main beam, with a total of 20 sixth radial secondary beams.

[0066] Between the adjacent first radial secondary beam and the fourth radial secondary beam and between the adjacent fourth radial secondary beams, three seventh radial secondary beams are respectively and evenly spaced from the outer periphery of the third ring-shaped main beam and extend to the outermost ring-shaped main beam. The total number of rings of the ring-shaped main beam 2 is 4 rings or more than 5 rings, such as 5 rings, 6 rings, 7 rings or 8 rings.

[0067] The cross-section of the bending member (arc 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 flange 401 and lower flange 402, and a first web 403 perpendicularly connected to the upper flange 401 and the lower flange 402. The T-shaped bending member 4 includes an upper flange 401 and a first web 403. The end portions of the upper flange 401, the lower flange 402 and the 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 connector or a "「"-shaped connector. 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 connector 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.

[0068] In one embodiment, a plurality of bending members 4 are sequentially connected into a ring-shaped main beam 2 via U-shaped connectors 6. Preferably, a U-shaped connector 6 is respectively arranged on both sides of the first web 403. The U-shaped connector 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 flange 401 and the lower flange 402 of the bending member 4, and the side plate 603 is attached to the first web 403 of the arc beam 4. Third through holes 604 are respectively provided at the end portions of the top plate 601, the bottom plate 602 and the side plate 603. A part of the U-shaped connector 6 coincides with the left bending member 4, and another part of the U-shaped connector 6 coincides with the right bending member 4. When the U-shaped connector 6 coincides with the bending member 4, the first through hole 404 corresponds to or is coaxial with the third through hole 604, and the bolt 7 passes through the first through hole 404 and the third through hole 604 and then is screwed into the nut 8 to realize the connection of the two bending members 4. A single-ring ring-shaped main beam 2 can be formed by connecting, for example, 15 - 400 bending members 4. The material of the U-shaped connector 6 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel and aluminum alloy.

[0069] 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 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. 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 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, for example.

[0070] Between adjacent annular main beams, the radial secondary beam 3 and the annular main beam 2 are connected via a T-shaped connector 9. The T-shaped connector 9 includes a flange 901 that fits against the first web 403 and two beam ribs 902 extending from the middle of the flange 901. A fifth through-hole 903 is formed on the beam ribs 902, and sixth through-holes 904 are formed on the flange 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 the 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. 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 between the radial secondary beam 3 and the T-shaped connector 9. Then, the flange 901 of the T-shaped connector 9 fits against the first web 403. The sixth through-hole 904 is coaxial with 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 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.

[0071] 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 the 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 flanges 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 simultaneously in contact with the vertical plates 502 of the two lugs 5. The seventh through-hole 504 corresponds to or is coaxial with the fourth through-hole 303. After the bolt 7 passes through the seventh through-hole 504 and the fourth through-hole 303, it is screwed into the nut 8 to realize the connection between the radial secondary beam 3 and the central hole member 1.

[0072] In another preferred embodiment, as Figure 13As shown, in areas where local strengthening is required (such as areas where large manholes, process nozzles, etc. pass through the ceiling), strengthening members, namely 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 through T-shaped connectors 9. The T-shaped connectors 9 include 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 (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.

[0073] The materials of the bolts 7 and nuts 8 can be any one of carbon steel, C-Mn low alloy steel, austenitic stainless steel, and aluminum alloy, for example. Embodiment 1

[0074] A support structure framework for the ceiling of a cryogenic 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 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. 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 and the annular main beams 2 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, and the T-shaped connectors 9 are fixedly connected to the radial secondary beams 3 through bolts and nuts. And the flange or wing plate 901 of the T-shaped connectors 9 is fixedly connected to 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 bending members 4 through U-shaped connectors 6, bolts 7, and nuts 8.

[0075] 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 ring of annular main beams 2 through radial secondary beams 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.

[0076] 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.

[0077] The configuration of the radial secondary beams is as Figure 2 shown. There are a total of 5 rings of annular main beams.

[0078] 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 force on each component more uniform. At the same time, since the radial secondary beams are connected to the annular main beam through T-shaped connectors, and the annular main beam is formed by connecting multiple pre-bent bending members through U-shaped connectors, the material cost, construction and installation cost, and construction period of the ceiling are greatly reduced, resulting in a significant reduction in the total cost of the ceiling. Embodiment 2

[0079] Same as Embodiment 1, except that in the area where local strengthening is required, a strengthening member, i.e., the diagonal beam 10, is added between 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 (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

[0080] 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

[0081] For the ceiling of a cryogenic liquefied gas storage tank, a support framework connected by aluminum alloy profiles is adopted. This support framework 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, which is not a truly complete axisymmetric structure. Moreover, the stress intensity and deformation of this structure during ceiling work or under extreme conditions do not meet the standard requirements.

[0082] 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), 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 annular main beam (2) are connected by a radial secondary beam (3).

3. The support structure framework according to claim 2, characterized in that, 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, wherein 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 framework according to claim 4, characterized in that A plurality of bent members (4) are sequentially connected into an annular main beam (2) through U-shaped connectors (6). A U-shaped connector (6) is arranged 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 attached to the upper flange (401) and the lower flange (402) of the bent member (4), and the side plates (603) are attached to the first web (403) of the bent 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 left bent member (4), and another part of the U-shaped connector (6) coincides with the right bent member (4). The first through hole (404) corresponds to the third through hole (604). After a bolt (7) passes through the first through hole (404) and the third through hole (604), it is screwed into a nut (8) to realize the connection of the two bent members (4).

6. The support structure framework according to claim 1, characterized in that, The radial secondary beams (3) diverge radially 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 through a T-shaped connector (9). The T-shaped connector (9) includes a flange (901) attached to the first web (403) and two beam ribs (902) extending from the middle of the flange (901). Fifth through holes (903) are formed in the beam ribs (902), and sixth through holes (904) are formed in the flanges (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). 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 a bolt (7) passes through the fourth through hole (303) and the fifth through hole (903), it is screwed into a nut (8) to realize the connection of the radial secondary beam (3) and the T-shaped connector (9). The flange (901) of the T-shaped connector (9) is attached to 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 a bolt (7) passes through the sixth through hole (904) and the second through hole (405), it is screwed into a 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, characterized in that, 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 radial secondary beam and the second radial secondary beam, 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 that are 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 annular main beam and the second annular 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 the adjacent fourth radial secondary beams. Between the first radial secondary beam and the fourth radial secondary beam 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 radial secondary beam and the fourth radial secondary beam 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 1-8, characterized in that, In the area that needs to be locally strengthened, 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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