Tank ceiling ring beam connection device

Abstract

The present application relates to a kind of storage tank ceiling radial ring beam connecting device, it includes the multiple ring beams distributed from center portion to periphery in turn and the multiple radial beams distributed radially, from the most inside ring beam entire periphery, multiple evenly spaced radial beams extend to the inside of the most outer ring beam, from the inside penultimate ring beam, multiple radial beams also extend to the inside of the most outer ring beam, and radial beam is connected with ring beam at connecting point by L-shaped connecting plate.The storage tank ceiling radial ring beam connecting device of the present application overcomes the shortcomings of traditional welding connection, realizes site without any welding, and will not produce gas harmful to human body and environment.Premounting is carried out on the ground outside tank before installation, guarantees the flatness of entire beam surface, simultaneously, construction is easy and saves construction period.

Description

Technical Field

[0001] This invention relates to a circumferential beam connection device for a storage tank ceiling. Background Technology

[0002] In the LNG receiving terminal, 220,000 m³ 3 LNG storage tanks require an aluminum suspended ceiling, suspended directly above the inner tank, to support the insulation material at the top of the inner tank. This reduces heat transfer to the LNG within the inner tank and lowers the LNG evaporation rate. The primary function of the suspended ceiling is to support the insulation material and prevent it from falling into the liquefied natural gas stored inside the inner tank. Simultaneously, the suspended ceiling must be able to withstand its own weight, the insulation material, piping and bushings, pressure balancing ports, and construction loads generated during construction, ensuring the safety of construction personnel.

[0003] Currently, there are 220,000 m³ of such facilities in China. 3 The ceiling design used in LNG storage tanks employs corrugated sheets laid on radial circumferential beams. The entire load-bearing capacity of the ceiling is borne by the radial circumferential beams. The arrangement of the radial circumferential beams is shown in [reference needed]. Figure 1 Currently, the radial circumferential beams of the suspended ceiling are connected by welding. Figure 2 and Figure 3 .

[0004] At the LNG receiving terminal, for 220,000 m³ 3 LNG storage tanks, typically large ones, consist of 6 ring beams and 40 radial beams, with 240 connection points between the ring and radial beams. This results in an enormous amount of welding work, and since assembly and welding are carried out within the sealed space of the tank top, large hoisting equipment is required, making construction extremely difficult. The radial ring beams use a welded structure, which is prone to welding deformation, causing unevenness across the entire support beam surface. The enclosed welding environment is extremely harsh and unfavorable, especially when using aluminum materials (the radial ring beams are made of 6061-T2 aluminum alloy), which can easily generate gases harmful to human health. Furthermore, the construction period is long and the cost is high.

[0005] Therefore, there is an urgent need in this field for an improved circumferential beam connection device for tank ceilings. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides a circumferential beam connection device for tank ceiling. This connection device does not use any welding, overcomes the disadvantages of traditional welding connection, and is easy to construct and saves construction time.

[0007] This invention is achieved by adopting the following technical solution.

[0008] A circumferential beam connection device for a storage tank ceiling includes a plurality of circumferential beams distributed sequentially from the center outwards and a plurality of radial beams distributed radially, for example, 4-10 circumferential beams distributed from the inside outwards, further 5-8 circumferential beams, such as 6 circumferential beams. The spacing between adjacent circumferential beams is preferably substantially equal. A plurality of radial beams (e.g., 4-8 radial beams, preferably 6 radial beams, and evenly spaced) extend from the entire outer periphery of the inner circumferential beam to the inner side of the outermost circumferential beam. A plurality of radial beams also extend from the penultimate circumferential beam to the inner side of the outermost circumferential beam. Preferably, the plurality of radial beams extending from the penultimate circumferential beam (adjacent to the innermost circumferential beam) are located between two adjacent radial beams extending from the innermost circumferential beam, preferably in the middle.

[0009] The circumferential beam and radial beam have an I-shaped cross-section (including an upper flange, a lower flange, and a web connecting the upper and lower flanges in the middle). The radial beam and the circumferential beam are on the same horizontal plane. The radial beam is discontinuous at the circumferential beam (i.e., the radial beam is discontinuous at the circumferential beam). The radial beam has notches on the upper and lower sides of the end connected to the circumferential beam (the upper and lower flanges, and even a small portion of the web, are removed). The notches fit into the recesses of the I-shaped circumferential beam (the notches formed between the upper and lower flanges on one side and the web in the middle), allowing it to be inserted into the circumferential beam and approach or abut against the web of the I-shaped circumferential beam.

[0010] L-shaped connecting plates are provided on both the left and right sides of the end of the radial beam connected to the circumferential beam. The L-shaped connecting plate includes a circumferential panel and a radial panel that are connected to each other (preferably integrally formed). The radial panel is longer than the circumferential panel, for example, 120-200 mm, and the circumferential panel is for example, 60-100 mm. The circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the I-beam, and the radial panel of the L-shaped connecting plate overlaps with the side of the web of the radial beam. The circumferential panel of the L-shaped connecting plate is fixed to the web of the I-beam by bolts, and the radial panel of the L-shaped connecting plate is fixed to the side of the radial beam by bolts. The contact part between the radial beam and the circumferential beam is not welded. Specifically, an L-shaped connecting plate is set on the outer side of the innermost circumferential beam and the inner side of the outermost circumferential beam, and on the left and right sides of the radial beam (a total of 2 L-shaped connecting plates are set at one connection point). At the connection point between the intermediate circumferential beam and the radial beam located between the innermost and outermost rings, L-shaped connecting plates are set on the inner and outer sides of the circumferential beam and on the left and right sides of the radial beam (equivalent to a total of 4 L-shaped connecting plates being set at this connection point).

[0011] Furthermore, the height of the radial and circumferential beams (the height between the upper and lower flanges) is generally between 100-200 mm, preferably 110-180 mm, more preferably 120-150 mm, and even more preferably 125-130 mm. The thickness of the upper and lower flanges and the web is generally 6-12 mm, preferably 7-10 mm, more preferably 7.5-8.5 mm, for example 8 mm. The height of the web is generally 80-180 mm, preferably 90-150 mm, more preferably 100-130 mm, and more preferably 110-120 mm. Preferably, the height of the upper and lower notches at the ends of the radial beam is equal to or slightly greater than the thickness of the upper and lower flanges, and the length of the notches is equal to or slightly less than the distance between the upper and lower flanges and the sidewalls of the web, such that the notches are just inserted into the notches formed between the upper and lower flanges and the web. The radial and circumferential beams can be made of aluminum alloy, for example, aluminum alloy 6061-T2.

[0012] Furthermore, the diameter of the outermost circumferential beam is equal to or slightly smaller than the inner diameter of the storage tank, the spacing between adjacent circumferential beams is generally 1 / 4 to 1 / 8 of the inner radius of the storage tank, preferably about 1 / 5 to 1 / 6, and the inner diameter of the innermost circumferential beam is preferably 1 / 4 to 1 / 8 of the inner diameter of the storage tank, preferably about 1 / 5 to 1 / 6.

[0013] Furthermore, the circumferential beam and radial beam are connected using detachable bolts. At each connection point, two (for the innermost and outermost rings) or four (for the middle circumferential beam connection points) connecting plates are used, preferably stainless steel connecting plates. The stainless steel plates are L-shaped, with dimensions of 120-200×60-100×4-10mm, for example, 150×80×5mm (length, height, and thickness). The width of the L-shaped stainless steel connecting plate is preferably 60-100mm, for example, 80mm. A hole is made in the circumferential panel (shorter in length) of the L-shaped connecting plate (preferably in the middle position), and two spaced holes are made in the radial panel (longer in length) of the L-shaped connecting plate (one hole can be located in the middle, near the intersection of the centerlines of the length and width directions of the radial panel, or from...). The central intersection point is slightly offset to one side of the connection point (between the radial and circumferential beams). Another hole can be located on the side away from the connection point, preferably in the middle between the hole near the connection point and the end of the radial panel (the end away from the connection point). The hole diameter is φ15-25mm, for example, φ18mm. Holes are made at corresponding positions on the circumferential and radial beams (the hole diameter matches the holes on the L-shaped connecting plate; one hole on each side of the circumferential beam connection point, and two holes on each side of the radial beam connection point). Bolts are secured with nuts after passing through the holes on the radial beam and the L-shaped connecting plates on both sides of the radial beam, as well as after passing through the holes on the circumferential beam and the L-shaped connecting plates on one side (the innermost and outermost circumferential beams) or both sides (the middle circumferential beams). Bolts and nuts are, for example, M16 stainless steel bolts and nuts.

[0014] Advantages of the present invention

[0015] The novel radial circumferential beam connection device of this invention overcomes the shortcomings of traditional welded connections, achieving zero welding on-site, producing no gases harmful to humans and the environment, exhibiting a robust structure that meets strength requirements, and ensuring safety and reliability. Pre-assembly on the ground outside the tank before installation ensures the flatness of the entire beam surface, while also simplifying construction and saving time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the circumferential beam connection device for the storage tank ceiling.

[0017] Figure 2 This is a partial view of the connection part of an existing radial ring beam welded connection structure.

[0018] Figure 3 The figure shows the AA-line cross-sectional view of the connection part of the existing radial and circumferential beam welded connection structure. In the figure, reference numeral 31 is the connection weld between the circumferential beam and the radial beam, and a chamfer of 10X45° is required. The dimensions of the circumferential beam are 125×125×8mm, and the dimensions of the radial beam are 125×125×8mm (width, height and thickness dimensions of the I-beam cross-section).

[0019] Figure 4 This is a partial view of the connection part of the radial ring beam connection structure of the present invention.

[0020] Figure 5 for Figure 4 BB line cross-section diagram of the radial ring beam connection structure.

[0021] Figure 6 for Figure 5 The cross-sectional view of the diameter ring beam connection structure along the CC line.

[0022] Figure 7 (a) and (b) are schematic diagrams of the cross section and side view of the radial beam after cutting, respectively, showing that a section of the upper and lower flanges at the end of the radial beam has been removed.

[0023] Figure 8 (a) and (b) are the side view and top view of the L-shaped connecting plate, respectively.

[0024] Figure 9 (a) and (b) are schematic diagrams of the undeformed circumferential beam and the deformed circumferential beam, respectively.

[0025] Figure 10 (a), (b), (c) and (d) are force analysis diagrams of the connection points of the radial ring beam.

[0026] Figure 11 for Figure 10 (c) Force analysis diagram of bolt A1.

[0027] Reference numerals: 1-Radial beam, 2-Circumferential beam, 101-Web plate, 102-Upper flange, 103-Lower flange, 3-Radial and circumferential beam connection, 4-L-shaped connecting plate, 5-Bolt, 31-Connecting weld between circumferential and radial beams, 6-Hanging rod, 7-M16 bolt. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1-8 As shown, a circumferential beam connection device for a storage tank ceiling includes multiple circumferential beams 2 distributed sequentially from the center outwards and multiple radial beams 1 distributed radially, for example, 4-10 circumferential beams 2 distributed from the inside outwards, further 5-8 circumferential beams, such as 6 circumferential beams. Preferably, the spacing between adjacent circumferential beams 2 is substantially equal. Multiple evenly spaced radial beams 1 (e.g., 4-8 radial beams, preferably 6 radial beams) extend from the entire outer periphery of the innermost circumferential beam to the inner side of the outermost circumferential beam 2. Multiple radial beams also extend from the penultimate circumferential beam to the inner side of the outermost circumferential beam 2. Preferably, the multiple radial beams extending from the penultimate circumferential beam are located between two adjacent radial beams extending from the innermost circumferential beam, preferably at the middle of two adjacent radial beams (i.e., the included angle between the radial beam extending from the penultimate circumferential beam and the two adjacent radial beams extending from the innermost circumferential beam is equal).

[0030] The circumferential beam and radial beam have an I-shaped cross-section (including an upper flange 102, a lower flange 103, and a web 101 connecting the upper flange and the lower flange). The radial beam 1 and the circumferential beam 2 are on the same horizontal plane. The radial beam is discontinuous at the circumferential beam (i.e., the radial beam is discontinuous at the circumferential beam). The radial beam has notches on the upper and lower sides of the end connected to the circumferential beam (the upper and lower flanges, and even a small portion of the web, are removed). The notches are adapted to the recesses of the I-shaped circumferential beam (the notches formed between the upper and lower flanges on one side and the web in the middle), so that they can be inserted into the circumferential beam and approach or abut against the web 101 of the I-shaped circumferential beam.

[0031] L-shaped connecting plates 4 are installed on both the left and right sides of the end of the radial beam connected to the circumferential beam (see...). Figure 8The L-shaped connecting plate 4 includes interconnected (and preferably integrally formed) circumferential and radial panels (preferably the radial panel is longer than the circumferential panel, for example, 120-200 mm, and the circumferential panel is for example, 60-100 mm). The circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the I-beam, and the radial panel of the L-shaped connecting plate overlaps with the side of the web of the radial beam 1. The circumferential panel of the L-shaped connecting plate is fixed to the web 101 of the I-beam by bolts 5, and the radial panel of the L-shaped connecting plate is fixed to the side of the radial beam by bolts 5. The contact area between the radial beam and the circumferential beam is not welded. Specifically, at the connection points between the innermost and outermost circumferential beams and the radial beam, and on the outer side of the innermost circumferential beam connected to the radial beam and the inner side of the outermost circumferential beam, an L-shaped connecting plate 4 is set on each of the left and right sides of the radial beam (a total of 2 L-shaped connecting plates are set at one connection point). At the connection point between the intermediate circumferential beam and the radial beam between the innermost and outermost rings connected to the radial beam, an L-shaped connecting plate 4 is set on the inner and outer sides of the circumferential beam and on the left and right sides of the radial beam (equivalent to a total of 4 L-shaped connecting plates being set at this connection point).

[0032] The height of radial beam 1 and circumferential beam 2 (the height between the upper and lower flanges) is generally between 100-200 mm, preferably 110-180 mm, more preferably 120-150 mm, and even more preferably 125-130 mm. The thickness of the upper and lower flanges and the web is generally 6-12 mm, preferably 7-10 mm, more preferably 7.5-8.5 mm. The height of the web is generally 80-180 mm, preferably 90-150 mm, more preferably 100-130 mm, and more preferably 110-120 mm. Preferably, the height of the upper and lower notches at the ends of the radial beam is equal to or slightly greater than the thickness of the upper and lower flanges, and the length of the notches is equal to or slightly less than the distance between the upper and lower flanges and the sidewalls of the web, so that the notches are just inserted into the notches formed between the upper and lower flanges and the web. The radial beam and the circumferential beam can be made of aluminum alloy, for example, aluminum alloy 6061-T2.

[0033] The diameter of the outermost circumferential beam is equal to or slightly smaller than the inner diameter of the storage tank. The spacing between adjacent circumferential beams is generally 1 / 4 to 1 / 8 of the inner radius of the storage tank, preferably about 1 / 5 to 1 / 6. The inner diameter of the innermost circumferential beam is preferably 1 / 4 to 1 / 8 of the inner diameter of the storage tank, preferably about 1 / 5 to 1 / 6.

[0034] The circumferential beam and radial beam are connected using detachable bolts 5. At each connection point (radial circumferential beam connection 3), two (inner and outermost ring connection points) or four (middle circumferential beam connection points) connecting plates are used, preferably stainless steel connecting plates. The stainless steel plates are L-shaped, with dimensions of 120-200×60-100×4-10mm, for example, 150×80×5mm (length, height, and thickness dimensions). The width of the L-shaped stainless steel connecting plate is preferably 60-100mm, for example, 80mm. A hole is made in the circumferential panel (shorter in length) (preferably in the middle position) of the L-shaped connecting plate, and two spaced holes are made in the radial panel (longer in length) of the L-shaped connecting plate (one hole can be located in the middle, near the intersection of the center lines in the length and width directions of the radial panel, or from the center). The intersection point is slightly offset to one side of the connection point (between the radial and circumferential beams). Another hole can be located away from the connection point (preferably in the middle between the hole near the connection point and the end of the radial panel away from the connection point). The hole diameter is φ15-25mm, for example, φ18mm. Holes are made at corresponding positions on the circumferential and radial beams (the hole diameter matches the holes on the L-shaped connecting plate; one on each side of the circumferential beam connection point, and two on each side of the radial beam connection point). Bolts 5 are passed through the holes on the radial beam and the L-shaped connecting plates on both sides of the radial beam and secured with nuts. Bolts are also passed through the holes on the circumferential beam and the L-shaped connecting plates on one side (the innermost and outermost circumferential beams) or both sides (the middle circumferential beams) of the circumferential beam and secured with nuts. Bolts and nuts are, for example, M16 stainless steel bolts and nuts.

[0035] Example 1

[0036] A circumferential beam connection device for a storage tank ceiling includes five circumferential beams 2 distributed sequentially from the center outwards and sixteen radial beams 1 distributed radially. The spacing between adjacent circumferential beams 2 is substantially equal. Eight evenly spaced radial beams 1 extend from the entire outer periphery of the innermost circumferential beam to the inner side of the outermost circumferential beam 2. Eight radial beams also extend from the second-to-last circumferential beam from the inside. The eight radial beams extending from the second-to-last circumferential beam from the inside are respectively located in the middle of two adjacent radial beams extending from the innermost circumferential beam.

[0037] The circumferential beam and radial beam have I-shaped cross-sections, including an upper flange 102, a lower flange 103, and a web 101 located in the middle connecting the upper flange and the lower flange. The radial beam 1 and the circumferential beam 2 are on the same horizontal plane, and the radial beam is discontinuous at the circumferential beam (i.e., the radial beam is discontinuous at the circumferential beam).

[0038] like Figure 7In this manner, the radial beam is cut at its end, removing the upper and lower flanges of one end section. The notch fits into the recess of the I-beam circumferential beam (the notch formed between the upper and lower flanges on one side and the web in the middle), allowing it to be inserted into the circumferential beam and approach or abut against the web 101 of the I-beam circumferential beam. Fabrication is as follows... Figure 8 The stainless steel L-shaped connecting plates shown have three φ18mm bolt holes on each plate. Insert the radial beam into the circumferential beam, install the stainless steel L-shaped connecting plates, and at the corresponding bolt hole positions on the connecting plates, drill two (to the innermost and outermost circumferential beams) or four (to the middle circumferential beams) φ18mm bolt holes on the radial beam at each connection point. At each connection point, drill two φ18mm bolt holes on the circumferential beam. Connect the L-shaped connecting plates at each connection point using bolts and nuts.

[0039] The new radial circumferential beam connection device overcomes the shortcomings of traditional welded connections, achieving zero welding on-site, producing no gases harmful to humans and the environment, and boasting a robust structure that meets strength requirements. Pre-assembly on the ground outside the tank before installation ensures the flatness of the entire beam surface, while also simplifying construction and saving time.

[0040] Experimental Example

[0041] In the LNG receiving terminal, 2.2 × 10 5 m 3 The LNG storage tank consists of 6 ring beams and 40 radial beams, with 240 connection points between the ring and radial beams. This results in a large amount of welding work, and the assembly and welding are all carried out within the sealed space of the tank top plate, making construction difficult. Furthermore, the welding process can easily generate harmful gases and cause welding deformation, resulting in an uneven surface on the entire support beam. To avoid these problems, the welding method for the ring and radial beam connection points was changed to bolts and L-shaped stainless steel plates. A stress analysis was performed and the connection was verified.

[0042] In this experimental example, the total mass of the suspended ceiling is 1 × 10⁻⁶. 5 The ring beam has 240 connection points, with an average mass of approximately 416.67 kg per connection point. Considering the uneven stress distribution at the nodes, a safety factor r of 1.5 is selected. Therefore, the mass borne by each connection point is calculated as 416.67 * 1.5 ≈ 625 kg. The bolts are made of 304 stainless steel with a diameter d = 16 mm. b =16mm is the projected length of the bolt diameter on the radial beam web, l c=16mm is the projected length of the bolt diameter on the L-shaped stainless steel plate. The allowable tensile stress [σ] is 155.13MPa (selected from Table Q-3 according to standard API Std 620-2002 Design and Construction of Large Welded Low-Pressure Storage Tanks). According to mechanics of materials, the allowable shear stress [τ] of the bolt is related to the tensile stress [σ] of the material, and the relationship between the two is [τ] = (0.75~0.8)*[σ]. According to the formula, the allowable compressive stress [σ] of the bolt... jya The yield point is obtained by dividing by 1.1, and the result is [σ]. jya The allowable shear stress [τ] is 186.36 MPa. In this project, for bolts made of 304 stainless steel, the allowable shear stress [τ] is selected as 116.35 MPa, and the allowable compressive stress [σ] is selected as 186.36 MPa. jya ]=186.36MPa. For a beam made of 6061-T2 aluminum alloy, its allowable compressive stress [σ jyb = 55.16 MPa. Where the thickness t of the radial beam web is... b The thickness t of the L-shaped stainless steel is 8mm. c It is 5mm.

[0043] The circumferential beam is suspended from the tank top by boom 6. Let's analyze a section of the circumferential beam: First, consider the boom as a rigid body, meaning it will not deform. The booms are installed at both ends of the circumferential beam. Under gravity, the circumferential beam suspended by the boom will undergo slight deformation, with the largest deformation occurring in the middle of the beam. Figure 9 As shown.

[0044] The connection point between the circumferential beam and the radial beam is achieved by using L-shaped stainless steel plates and bolts instead of the original welding method. Specifically, the radial beam, after being cut and drilled, is inserted into the circumferential beam. The L-shaped stainless steel plate (5mm thick) serves as the connecting and reinforcing plate and is bolted to the circumferential beam. There are two bolts for the radial beam and one bolt for the circumferential beam. Before performing stress analysis on the connection point, the bolts are categorized and named, such as... Figure 10 As shown in (c). The circumferential beam is continuous, while the radial beam is discontinuous. The circumferential beam undergoes slight deformation under the action of the hangers; therefore, the force at the connection point mainly comes from the circumferential beam, denoted by P, as shown below. Figure 10 As shown in (a), the force P on the circumferential beam is transmitted through the stainless steel plate and the radial beam to the six bolts 7 used for fastening. A stress analysis of the entire bolt assembly is now performed. Since the radial beam is discontinuous, when the connection point is subjected to force, it will be distributed through… Figure 10 (a) The state changes to Figure 10 The state of (b). From Figure 10As can be seen in (b), the radial beams on both sides of the circumferential beam will undergo slight deformation and torsion. At this time, bolts B1 and B2 act as support points when the radial beams torsion, bolts C1 and C2 bear the pressure P from the circumferential beam, and bolts A1 and A2 bear the reaction force of pressure P. Figure 10 As shown in (d), the distance l1 from bolt A1 to bolt B1 is 45mm, and the distance l2 from bolt C1 to bolt B1 is 69mm. According to the torque balance formula, It can be determined that bolts A1 and A2 experience the greatest forces. Since all six bolts are of the same specification, the bolt experiencing the greatest force is selected for force analysis.

[0045] Force analysis was performed on bolt A1, and the results are as follows: Figure 11 As shown. Given that each connection point needs to bear a mass of 625 kg, the pressure of the circumferential beam on the radial beam is P = mg = 625 * 9.8 = 6125 N. This can be calculated using the moment balance formula. Shear force on the corresponding bolt

[0046] (1) Bolt shear strength calculation

[0047] Given that the allowable shear stress of the bolt [τ] = 116.35 MPa, the shear force on the bolt Q = 2347.92 N, and the shear area of ​​the bolt...

[0048] Shear stress on the bolt Substituting the values, we obtain τ = 11.68 MPa. The shear strength check is safe.

[0049] (2) Bolt extrusion strength calculation

[0050] Given the allowable compressive stress of the bolt [σ] jya =186.36MPa, the compressive force F on the bolt A1 = 4695.83N, the effective crushing area of ​​the bolt is A jya =t b *d=8*16=1.28×10 -4 m 2 The compressive stress borne by the bolt Substituting the values, we obtain σ. jya =36.69MPa. The bolt compressive strength meets the requirements.

[0051] Given that the radial beam is made of 6061-T2 aluminum alloy, its allowable compressive stress [σ] jyb = 55.16 MPa, the effective compressive area of ​​the radial beam web is A jyb =t b*l b =8*16=1.28×10 -4 m 2 The compressive stress borne by the web of the radial beam That is, σ jyb =36.69MPa. The compressive strength of the radial beam web meets the requirements.

[0052] The L-shaped stainless steel plate is made of the same material as the bolt, and its effective extrusion area is A. jyc =2*t c *l c =2*5*16=1.6×10 -4 m 2 The compressive stress borne by the L-shaped stainless steel plate Substituting the values, we obtain σ. jyc =29.34MPa. The extrusion strength of the L-shaped stainless steel plate meets the requirements.

[0053] Calculation results show that the bolt and L-shaped stainless steel plate fastening method of this patent is safe and reliable at the connection points of circumferential and radial beams. Compared with welding, the bolt and L-shaped stainless steel plate fastening method can effectively reduce construction difficulty, improve construction efficiency, and avoid the strong light and smoke pollution of welding during installation, which is beneficial to the personal safety of construction workers.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A circumferential beam connection device for a storage tank ceiling, characterized in that, It includes multiple circumferential beams (2) distributed sequentially from the center outwards and multiple radial beams (1) distributed radially. Multiple evenly spaced radial beams (1) extend from the entire outer periphery of the innermost circumferential beam (2) to the inner side of the outermost circumferential beam (2). Multiple radial beams (1) also extend from the penultimate circumferential beam (2) to the inner side of the outermost circumferential beam (2). The circumferential beam (2) and radial beam (1) have I-shaped cross sections, including an upper flange (102), a lower flange (103), and a web (101) connecting the upper flange and the lower flange in the middle. The radial beam (1) and the circumferential beam (2) are on the same horizontal plane. The radial beam is broken at the circumferential beam, that is, the radial beam is discontinuous at the circumferential beam. The radial beam has notches on the upper and lower sides of the end connected to the circumferential beam. The notches are adapted to the concave part of the I-shaped circumferential beam, so that they can be inserted into the circumferential beam and approach or abut against the web (101) of the I-shaped circumferential beam. L-shaped connecting plates (4) are provided on both the left and right sides of the ends of the radial beam connected to the circumferential beam. The L-shaped connecting plates (4) include circumferential and radial panels that are connected to each other. The circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the circumferential beam (2), and the radial panel of the L-shaped connecting plate overlaps with the side of the web of the radial beam (1). The circumferential panel of the L-shaped connecting plate is fixed to the web (101) of the I-shaped circumferential beam by bolts (5), and the radial panel of the L-shaped connecting plate is fixed to the side of the radial beam by bolts (5). The contact parts between the radial beam and the circumferential beam are not welded. On the outer side of the innermost circumferential beam connected to the radial beam and the inner side of the outermost circumferential beam, an L-shaped connecting plate (4) is provided on both the left and right sides of the radial beam. At the connection between the middle circumferential beam and the radial beam between the innermost and outermost circumferential beams connected to the radial beam, L-shaped connecting plates (4) are provided on both the inner and outer sides of the circumferential beam and the left and right sides of the radial beam.

2. The tank ceiling circumferential beam connecting device according to claim 1, characterized in that, Multiple radial beams extending from the entire outer perimeter of the innermost circumferential beam to the inner side of the outermost circumferential beam are evenly spaced circumferentially. Multiple radial beams extending from the penultimate innermost circumferential beam are located in the middle of two adjacent radial beams extending from the innermost circumferential beam.

3. The tank ceiling circumferential beam connection device according to claim 2, characterized in that, There are 4-8 radial beams.

4. The tank ceiling circumferential beam connection device according to claim 1, characterized in that, The height of the circumferential beam and radial beam is 100-200mm, the thickness of the upper and lower flanges and the web is 6-12mm, and the height of the web is 80-180mm.

5. The tank ceiling circumferential beam connecting device according to claim 4, characterized in that, The height of the circumferential beam and radial beam is 110-180mm, the thickness of the upper and lower flanges and the web is 7-10mm, and the height of the web is 90-150mm.

6. The tank ceiling circumferential beam connecting device according to claim 5, characterized in that, The height of the circumferential beam and radial beam is 125-130mm, the thickness of the upper and lower flanges and the web is 7.5-8.5mm, and the height of the web is 110-120mm.

7. The tank ceiling circumferential beam connecting device according to any one of claims 1-6, characterized in that, The radial and circumferential beams are made of aluminum alloy.

8. The tank ceiling circumferential beam connecting device according to any one of claims 1-6, characterized in that, The diameter of the outermost circumferential beam is equal to or slightly smaller than the inner diameter of the storage tank. The spacing between adjacent circumferential beams is 1 / 4 to 1 / 8 of the inner radius of the storage tank. The inner diameter of the innermost circumferential beam is 1 / 4 to 1 / 8 of the inner diameter of the storage tank.

9. The tank ceiling circumferential beam connecting device according to claim 8, characterized in that, The diameter of the outermost circumferential beam is equal to or slightly smaller than the inner diameter of the storage tank. The spacing between adjacent circumferential beams is 1 / 5 to 1 / 6 of the inner radius of the storage tank. The inner diameter of the innermost circumferential beam is 1 / 5 to 1 / 6 of the inner diameter of the storage tank.

10. The tank ceiling circumferential beam connecting device according to any one of claims 1-6, characterized in that, The circumferential beam and the radial beam are connected by detachable bolts (5). Each connection point of the innermost and outermost circumferential beams connected to the radial beams is connected by two L-shaped connecting plates, and the connection point of the intermediate circumferential beams is connected by four L-shaped connecting plates.

11. The tank ceiling circumferential beam connecting device according to claim 10, characterized in that, A hole is made on the circumferential panel of the L-shaped connecting plate, and two holes with a diameter of φ15-25mm are made on the radial panel of the L-shaped connecting plate. Holes are made at the corresponding positions of the circumferential beam and the radial beam. The bolt (5) is passed through the holes on the L-shaped connecting plates on both sides of the radial beam and fixed with nuts. The bolt (5) is passed through the opening on the circumferential beam and the opening on the L-shaped connecting plate on one or both sides of the circumferential beam and fixed with nuts.

12. The tank ceiling circumferential beam connecting device according to any one of claims 1-6, characterized in that, The length, height, and thickness of the L-shaped connecting plate are 120-200×60-100×4-10mm.

13. The tank ceiling circumferential beam connecting device according to claim 12, characterized in that, The length, height, and thickness of the L-shaped connecting plate are 150×80×5mm.

14. The tank ceiling circumferential beam connecting device according to claim 11, characterized in that, The bolts and nuts are M16 stainless steel bolts and nuts.

15. The tank ceiling circumferential beam connecting device according to claim 11, characterized in that, A hole is made in the middle of the circumferential panel of the L-shaped connecting plate, and two holes are made at intervals on the radial panel of the L-shaped connecting plate. One hole is located near the intersection of the center lines in the length and width directions of the radial panel or slightly off-center from the intersection of the center lines towards the connection point of the radial beam and the circumferential beam. The other hole is located on the side away from the connection point of the radial beam and the circumferential beam, in the middle between the hole near the connection point and the end of the radial panel.

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