Radial and annular beam connecting device of storage tank suspended ceiling

Abstract

The invention relates to a radial and annular beam connecting device for a storage tank suspended ceiling, which comprises a plurality of annular beams which are sequentially distributed from a central part to the periphery and a plurality of radial beams which are radially distributed, and a plurality of radial beams which are uniformly spaced extend from the whole periphery of the innermost annular beam to the inner side of the outermost annular beam; a plurality of radial beams also extend from the last but one inner annular beam to the inner side of the outermost annular beam, and the radial beams and the annular beams are connected at the connecting points through L-shaped connecting plates. According to the radial and circumferential beam connecting device for the storage tank suspended ceiling, the defects of traditional welding connection are overcome, no welding is needed on site, and gas harmful to the human body and the environment cannot be generated. Pre-assembly is conducted on the ground outside the tank before installation, the flatness of the whole beam face is guaranteed, meanwhile, construction is easy, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to a storage tank ceiling radial beam connecting device. Background Art

[0002] In the LNG receiving station, 220,000 m 3 LNG storage tanks need to be equipped with aluminum ceilings, which are suspended directly above the inner tank to support the insulation material on the top of the inner tank to reduce the heat transfer of the LNG in the inner tank and reduce the evaporation rate of LNG. The main function of the ceiling is to support the cold insulation material and prevent it from falling into the liquefied natural gas stored in the inner tank. At the same time, the ceiling should be able to withstand the weight of the ceiling itself, the cold insulation material, the connecting sleeve, the pressure balance port, and the construction load generated during the construction process to ensure the personal safety of the construction workers.

[0003] At present, the domestic 3 The ceiling form used in LNG storage tanks is to lay corrugated plates on radial and circumferential beams. The force of the entire ceiling is borne by the radial and circumferential beams. The arrangement of radial and circumferential beams is shown in Figure 1 ;Currently, the radial and circumferential beams of the suspended ceiling are connected by welding Figure 2 and Figure 3 .

[0004] In the LNG receiving station, 220,000 m 3 LNG storage tanks, usually a large LNG storage tank is composed of 6 ring beams and 40 radial beams. There are 240 connection points of the radial ring beams, and the welding workload is extremely large. In addition, the assembly and welding are carried out in the sealed space of the tank top plate. Large hoisting equipment is required for construction, which makes the construction difficult. The radial ring beam welding adopts a tailored welding structure, which is prone to welding deformation, making the entire support beam plane uneven. The closed welding working environment is very harsh and unfavorable, especially when aluminum is used for welding (the radial ring beam is aluminum alloy 6061-T2), which is easy to produce gases that are harmful to the human body. In addition, the construction period is long and the cost is high.

[0005] Therefore, there is an urgent need in the art for an improved storage tank ceiling radial beam connection device. Summary of the invention

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

[0007] The present invention is achieved by adopting the following technical solutions.

[0008] A storage tank ceiling radial annular beam connection device, comprising a plurality of annular beams distributed sequentially from a central part to the periphery and a plurality of radial beams distributed radially, for example, 4-10 annular beams distributed from the inside to the outside, further 5-8 annular beams, such as 6 annular beams, the spacing between adjacent annular beams is preferably substantially equal, a plurality of radial beams (for example, 4-8 radial beams, preferably 6 radial beams, and evenly spaced) extend from the entire periphery of the inner annular beam to the inner side of the outermost annular beam, a plurality of radial beams are also extended from the second to last annular beam of the inner side to the inner side of the outermost annular beam, and the plurality of radial beams extending from the second to last annular beam of the inner side (close to the innermost annular beam) are preferably respectively located between two adjacent radial beams extending from the innermost annular beam, preferably in the middle.

[0009] The cross-sectional shape of the annular beam and the radial beam is I-shaped (including an upper wing plate, a lower wing plate and a web connecting the upper wing plate and the lower wing plate), the radial beam and the annular beam are in the same horizontal plane, the radial beam is disconnected at the annular beam (that is, the radial beam is discontinuous at the annular beam), and the radial beam has notches on the upper and lower sides of the end connected to the annular beam (the upper and lower wing plates and even a small amount of the web are removed), and the notch part is adapted to the recess of the I-shaped annular beam (the notch formed between the upper and lower wing plates on one side and the web in the middle), so that it can be inserted into the annular beam and approach or abut against the web of the I-shaped annular beam.

[0010] L-shaped connecting plates are arranged on both sides of the end of the radial beam connected to the annular beam, and the L-shaped connecting plate includes a circumferential panel and a radial panel which are connected to each other (and preferably formed as one piece) (preferably the length of the radial panel is greater than the circumferential panel, the length of the radial panel is, for example, 120-200mm, and the length of the circumferential panel is, for example, 60-100mm), the circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the I-shaped annular 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-shaped annular beam by bolts, and the radial panel of the L-shaped connecting plate is fixed to the side of the radial beam by bolts, and the contact portion between the radial beam and the annular beam is not welded. Among them, on the outer side of the innermost circle annular beam connected to the radial beam and the inner side of the outermost circle annular beam, an L-shaped connecting plate is respectively arranged on the left and right sides of the radial beam (a total of 2 L-shaped connecting plates are arranged at one connection point), and at the connection between the middle annular beam located between the innermost circle and the outermost circle and the radial beam, L-shaped connecting plates are respectively arranged on the inner and outer sides of the annular beam and the left and right sides of the radial beam (equivalent to a total of 4 L-shaped connecting plates being arranged at this connection point).

[0011] Further, the height of the radial beam and the annular beam (the height between the upper wing plate and the lower wing plate) is generally between 100-200 mm, preferably 110-180 mm, preferably 120-150 mm, and further preferably 125-130 mm, the thickness of the upper and lower wing plates and the web plate is generally 6-12 mm, preferably 7-10 mm, preferably 7.5-8.5 mm, such as 8 mm, and the height of the web plate is generally 80-180 mm, preferably 90-150 mm, preferably 100-130 mm, and preferably 110-120 mm; preferably, the height of the upper and lower side notches at the ends of the radial beam is equal to or slightly greater than the thickness of the upper and lower wing plates, and the length of the notch is equal to or slightly less than the distance between the upper and lower wing plates and the side walls of the web plate, so that the notch portion is just inserted into the notch formed between the upper and lower wing plates and the web plate. The radial beam and the annular beam can be made of aluminum alloy, such as aluminum alloy 6061-T2.

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

[0013] Furthermore, the annular beam and the radial beam are connected by detachable bolts, and two (the connection points of the innermost circle and the outermost circle) or four (the connection points of the middle annular beam) connection plates are used at each connection point, preferably stainless steel connection plates, the stainless steel plate is L-shaped, and the size is 120-200×60-100×4-10mm, for example, 150×80×5mm (length, height, thickness), the width of the L-shaped stainless steel connection plate is preferably 60-100mm, for example, 80mm, a hole is opened on the circumferential panel (shorter length) of the L-shaped connection plate (preferably in the middle position), and two spaced holes are opened on the radial panel (longer length) of the L-shaped connection plate (one hole can be located in the middle, near the intersection of the midline of the length and width directions of the radial panel or from The central intersection is slightly biased to one side of the connection point (of the radial beam and the circumferential beam), and another hole can be located on the side away from the connection point, preferably in the middle position 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 opened at the corresponding positions of the circumferential beam and the radial beam (the hole diameter is consistent with the hole on the L-shaped connecting plate, one on each side of the connection point of the circumferential beam, and two on each side of the connection point of the radial beam), the bolts are fixed with nuts after passing through the holes on the radial beam and the L-shaped connecting plates on both sides of the radial beam, and the bolts are fixed with nuts after passing through the openings on the circumferential beam and the openings on the L-shaped connecting plates on one side (the innermost and outermost circumferential beams) or both sides (the middle circumferential beam) of the circumferential beam. The bolts and nuts are, for example, stainless steel bolts and nuts of specification M16.

[0014] Advantages of the present invention

[0015] The novel radial-circumferential beam connection device of the present invention overcomes the shortcomings of traditional welding connection, realizes no welding on site, does not produce gases harmful to human body and environment, has a firm structure, meets strength requirements, and is safe and reliable. It is pre-assembled on the ground outside the tank before installation, which ensures the flatness of the entire beam surface, and at the same time, the construction is easy and the construction period is saved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0019] Figure 4 It 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 of the radial ring beam connection structure.

[0021] Figure 6 for Figure 5 CC line cross-section of the radial ring beam connection structure.

[0022] Figure 7 (a) and (b) are the cross-sectional and side schematic diagrams of the radial beam after cutting, respectively, which show that a section of the upper and lower wing plates at the end of the radial beam are cut off.

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

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

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

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

[0027] Figure numerals: 1- radial beam, 2- circumferential beam, 101- web plate, 102- upper wing plate, 103- lower wing plate, 3- radial and circumferential beam connection part, 4- L-shaped connecting plate, 5- bolt, 31- connecting weld between circumferential beam and radial beam, 6- hanger rod, 7- M16 bolt. DETAILED DESCRIPTION

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

[0029] like Figure 1-Figure 8 As shown, a storage tank ceiling radial annular beam connection device comprises a plurality of annular beams 2 distributed sequentially from the central part to the periphery and a plurality of radial beams 1 distributed radially, for example, 4-10 annular beams 2 distributed from the inside to the outside, further 5-8 annular beams, such as 6 annular beams, preferably the spacing between adjacent annular beams 2 is basically equal, a plurality of evenly spaced radial beams 1 (for example, 4-8 radial beams, preferably 6 radial beams) extend from the entire periphery of the innermost annular beam to the inner side of the outermost annular beam 2, a plurality of radial beams are also extended from the second to last annular beam inside to the inner side of the outermost annular beam 2, preferably the plurality of radial beams extended from the second to last annular beam inside are respectively located between two adjacent radial beams extending from the innermost annular beam, preferably in the middle of two adjacent radial beams (that is, the angle between the radial beam extending from the second to last annular beam inside and the two adjacent radial beams extending from the innermost annular beam is equal).

[0030] The cross-section of the annular beam and the radial beam is an I-shaped beam (which includes an upper wing plate 102, a lower wing plate 103 and a web plate 101 in the middle connecting the upper wing plate and the lower wing plate), the radial beam 1 and the annular beam 2 are in the same horizontal plane, the radial beam is disconnected at the annular beam (that is, the radial beam is discontinuous at the annular beam), and the radial beam has notches on the upper and lower sides of the end connected to the annular beam (the upper and lower wing plates and even a small amount of the web plate are removed), and the notch part is adapted to the recess of the I-shaped annular beam (the notch formed between the upper and lower wing plates on one side and the web plate in the middle), so that it can be inserted into the annular beam and approach or abut against the web plate 101 of the I-shaped annular beam.

[0031] L-shaped connecting plates 4 are arranged on both sides of the ends of the radial beams connected to the annular beams (see Figure 8), the L-shaped connecting plate 4 includes a circumferential panel and a radial panel which are interconnected (and preferably formed as one piece) (preferably the radial panel is longer than the circumferential panel, the radial panel is, for example, 120-200mm long, and the circumferential panel is, for example, 60-100mm long), the circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the I-shaped annular beam, 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 annular 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, and the contact portion between the radial beam and the annular beam is not welded. Among them, at the connection between the innermost circle annular beam and the outermost circle annular beam and the radial beam, on the outer side of the innermost circle annular beam connected to the radial beam and the inner side of the outermost circle annular beam, an L-shaped connecting plate 4 is respectively arranged on the left and right sides of the radial beam (a total of 2 L-shaped connecting plates are arranged at one connection point), and at the connection between the middle annular beam between the innermost circle and the outermost circle connected to the radial beam and the radial beam, L-shaped connecting plates 4 are respectively arranged on the inner and outer sides of the annular beam and the left and right sides of the radial beam (equivalent to a total of 4 L-shaped connecting plates being arranged at this connection point).

[0032] The height of the radial beam 1 and the annular beam 2 (the height between the upper wing plate and the lower wing plate) is generally between 100-200 mm, preferably 110-180 mm, preferably 120-150 mm, and further preferably 125-130 mm. The thickness of the upper and lower wing plates and the web plate is generally 6-12 mm, preferably 7-10 mm, preferably 7.5-8.5 mm, and the height of the web plate is generally 80-180 mm, preferably 90-150 mm, preferably 100-130 mm, and preferably 110-120 mm. Preferably, the height of the upper and lower side notches at the ends of the radial beam is equal to or slightly greater than the thickness of the upper and lower wing plates, and the length of the notch is equal to or slightly less than the distance between the upper and lower wing plates and the side walls of the web plate, so that the notch portion is just inserted into the notch formed between the upper and lower wing plates and the web plate. The radial beam and the annular beam can be made of aluminum alloy, such as aluminum alloy 6061-T2.

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

[0034] The annular beam and the radial beam are connected by detachable bolts 5, and two (the innermost circle and the outermost circle connection points) or four (the middle annular beam connection points) connection plates are used at each connection point (the radial annular beam connection position 3), preferably stainless steel connection plates, the stainless steel plate is L-shaped, and the size is 120-200×60-100×4-10mm, for example, 150×80×5mm (length, height, thickness), the width of the L-shaped stainless steel connection plate is preferably 60-100mm, for example, 80mm, a hole is opened on the circumferential panel (shorter length) of the L-shaped connection plate (preferably in the middle position), and two spaced holes are opened on the radial panel (longer length) of the L-shaped connection plate (one hole can be located in the middle, near the intersection of the midline of the length and width direction of the radial panel or from the center) . The central intersection is slightly biased to one side of the connection point (of the radial beam and the circumferential beam), and the other hole can be located on the side away from the connection point (of the radial beam and the circumferential beam), preferably in the middle position 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 opened at the corresponding positions of the circumferential beam and the radial beam (the hole diameter is consistent with the hole on the L-shaped connecting plate, one on each side of the connection point of the circumferential beam, and two on each side of the connection point of the radial beam), the bolt 5 passes through the radial beam and the holes on the L-shaped connecting plate on both sides of the radial beam and is fixed with a nut, and the bolt passes through the opening on the circumferential beam and the opening on the L-shaped connecting plate on one side (the innermost and outermost circumferential beams) or both sides (the middle circumferential beam) of the circumferential beam and is fixed with a nut. The bolts and nuts are, for example, stainless steel bolts and nuts of specification M16.

[0035] Example 1

[0036] A storage tank ceiling radial annular beam connection device comprises 5 annular beams 2 distributed sequentially from a central part to the periphery and 16 radial beams 1 distributed radially, the spacing between adjacent annular beams 2 is substantially equal, 8 evenly spaced radial beams 1 extend from the entire periphery of the innermost annular beam to the inner side of the outermost annular beam 2, 8 radial beams extend from the second to last annular beam inside, and the 8 radial beams extending from the second to last annular beam inside are respectively located between two adjacent radial beams extending from the innermost annular beam.

[0037] The cross-section of the annular beam and the radial beam is an I-shaped beam, which includes an upper wing plate 102, a lower wing plate 103, and a web 101 in the middle connecting the upper wing plate and the lower wing plate. The radial beam 1 and the annular beam 2 are in the same horizontal plane, and the radial beam is disconnected at the annular beam (that is, the radial beam is discontinuous at the annular beam).

[0038] like Figure 7The radial beam end is cut in this way, and the upper and lower wing plates of the end section of the radial beam are cut off, and the notched part is adapted to the recess of the I-shaped annular beam (the recess formed between the upper and lower wing plates on one side and the middle web plate), so that it can be inserted into the annular beam and approach or abut against the web plate 101 of the I-shaped annular beam. Figure 8 The stainless steel L-shaped connecting plate shown has 3 φ18mm bolt holes on each plate. Insert the radial beam into the annular beam, install the stainless steel L-shaped connecting plate, and open 2 (connection points with the innermost and outermost annular beams) or 4 (connection points with the middle annular beam) φ18mm bolt holes on the radial beam at each connection point at the bolt hole positions corresponding to the connecting plate, and open 2 φ18mm bolt holes on the annular beam at each connection point. Connect the L-shaped connecting plate with bolts and nuts at each connection point.

[0039] The new radial and circumferential beam connection device overcomes the shortcomings of traditional welding connections, realizes no welding on site, does not produce gases harmful to the human body and the environment, and has a firm structure that meets strength requirements. Pre-assembly on the ground outside the tank before installation ensures the flatness of the entire beam surface, and at the same time, the construction is easy and the construction period is saved.

[0040] Experimental example

[0041] In LNG receiving stations, 2.2×10 5 m 3 LNG storage tanks are composed of 6 ring beams and 40 radial beams. There are 240 connection points of the radial ring beams, which requires a lot of welding work. In addition, both assembly and welding are carried out in the sealed space of the tank top plate, which makes construction difficult. In addition, the welding process is prone to produce harmful gases to the human body and welding deformation, making the entire support beam plane uneven. In order to avoid these conditions, the welding method of the radial ring beam connection point is changed to the bolt and L-shaped stainless steel plate connection method, and a force analysis and verification are carried out.

[0042] In this experimental example, the total mass of the ceiling is 1×10 5 kg, the diameter of the ring beam has 240 connection points, and the average mass distributed to each connection point is about 416.67kg. Considering the uneven force on the node, the safety factor r is selected as 1.5, and the mass borne by each connection point is calculated as 416.67*1.5≈625kg. The bolt is made of 304 stainless steel, with a diameter of d=16mm, l b =16mm is the projection 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, and the allowable tensile stress value [σ] is 155.13MPa (selected from Table Q-3 according to the standard API Std 620-2002 Design and Construction of Large Welded Low-Pressure Storage Tanks). According to material mechanics, 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 extrusion stress [σ] of the bolt is jya ] is obtained by dividing the yield point by 1.1, and the result is [σ jya ]=186.36MPa. In this project, for the bolts made of 304 stainless steel, the allowable shear stress [τ]=116.35MPa and the allowable extrusion stress [σ jya ]=186.36MPa. For 6061-T2 aluminum alloy beam, the allowable extrusion stress [σ jyb ]=55.16MPa. The thickness of the radial beam web is t b The thickness of L-shaped stainless steel is 8mm. c is 5mm.

[0043] The ring beam is suspended on the tank top by the hanger 6. Take a section of the ring beam for analysis: First, the hanger is regarded as a rigid body and will not deform. The hanger is installed at both ends of the ring beam. Under the action of gravity, the ring beam suspended by the hanger will deform slightly, and the deformation is the largest in the middle of the ring beam. Fig. 9 shown.

[0044] The connection point between the annular beam and the radial beam uses an L-shaped stainless steel plate and bolt fastening method to replace the original welding method. The specific implementation method is: insert the radial beam after cutting and punching into the annular beam, and use the L-shaped stainless steel plate (stainless steel connecting plate, thickness 5mm) as a connecting and reinforcing plate to fasten it to the radial beam by bolts. The number of bolts for the radial beam is 2, and the number of bolts for the annular beam is 1. Before performing a force analysis on the connection point, the bolts on the connection point are classified and named, such as Fig.10 As shown in (c), it is known that the annular beam is continuous and the radial beam is disconnected. The annular beam will deform slightly under the action of the hanger. Therefore, the force borne by the connection point mainly comes from the annular beam, which is represented by P, as shown in Fig.10 (a) As shown. The force P on the annular beam will eventually be transmitted to the six bolts 7 used for connection and fastening through the stainless steel plate and radial beam. Now the force analysis of the integral bolts is carried out. Since the radial beam is disconnected, when the connection point is stressed, Fig.10 The state of (a) changes to Fig.10 (b) Status. Fig.10As can be seen from (b), the radial beams on both sides of the annular beam will undergo slight deformation and torsion. At this time, the B1 and B2 bolts bear the fulcrum role when the radial beam torsions, the C1 and C2 bolts bear the pressure P brought by the annular beam, and the A1 and A2 bolts bear the reaction force of the pressure P. Fig.10 As shown in (d), it is known that 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 moment balance formula, It can be found that the A1 and A2 bolts are subject to the greatest force. Since the specifications of the six bolts are the same, the single bolt with the greatest force is selected for force analysis.

[0045] Select A1 bolt for force analysis, the results are as follows Fig.11 As shown. It is known that each connection point needs to bear a mass of 625kg, and the pressure of the annular beam on the radial beam is P = mg = 625 * 9.8 = 6125N. According to the moment balance formula, it can be obtained Corresponding shear force on the bolt

[0046] (1) Calculation of bolt shear strength

[0047] It is known that the allowable shear stress of the bolt [τ] = 116.35MPa, the shear force on the bolt Q = 2347.92N, and the shear surface area of ​​the bolt

[0048] Shear stress on the bolt Substitute it into the equation and we get τ = 11.68 MPa. The shear strength is checked for safety.

[0049] (2) Calculation of bolt extrusion strength

[0050] The allowable extrusion stress of the known bolt [σ jya ]=186.36MPa, the extrusion force F on the bolt A1 =4695.83N, the effective extrusion area of ​​the bolt is A jya =t b *d = 8 * 16 = 1.28 × 10 -4 m 2 The extrusion stress on the bolt Substitute into to obtain σ jya =36.69MPa. The bolt extrusion strength meets the requirements.

[0051] It is known that the radial beam is made of 6061-T2 aluminum alloy, and its allowable extrusion stress [σ jyb ]=55.16MPa, the effective extrusion area of ​​the radial beam web is A jyb =t b*l b =8*16=1.28×10 -4 m 2 The compressive stress on the radial beam web That is, σ jyb =36.69MPa. The radial beam web extrusion strength 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 . Extrusion stress of L-shaped stainless steel plate Substitute into the solution to obtain σ jyc =29.34MPa. The extrusion strength of L-shaped stainless steel plate meets the requirements.

[0053] The calculation results show that the bolt and L-shaped stainless steel plate fastening method of the patent is safe and reliable at the connection point between the annular beam and the radial beam. Compared with welding, the method of fastening with bolts and L-shaped stainless steel plates can effectively reduce the construction difficulty and improve the construction efficiency. In addition, the strong light and fume pollution caused by welding will not be generated during the installation process, which is beneficial to the personal safety of construction workers.

[0054] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A connection device for the radial beam of a storage tank ceiling, characterized in that: It comprises a plurality of circumferential beams (2) distributed in sequence from the central part to the outer circumference and a plurality of radial beams (1) distributed radially, a plurality of radial beams (1) evenly spaced from the entire outer circumference of the innermost circumferential beam (2) extending to the inner side of the outermost circumferential beam (2), and a plurality of radial beams (1) also extending from the second to last circumferential beam (2) inside to the inner side of the outermost circumferential beam (2), The cross-section of the annular beam (2) and the radial beam (1) is an I-shaped beam, comprising an upper wing plate (102), a lower wing plate (103) and a web plate (101) in the middle connecting the upper wing plate and the lower wing plate. The radial beam (1) and the annular beam (2) are located in the same horizontal plane. The radial beam is disconnected at the annular beam, that is, the radial beam is discontinuous at the annular beam. The radial beam has notches at the upper and lower sides of the end connected to the annular beam. The notch portion is adapted to the recess of the I-shaped annular beam, so that the radial beam can be inserted into the annular beam and approach or abut against the web plate (101) of the I-shaped annular beam. L-shaped connecting plates (4) are arranged on both left and right sides of the end of the radial beam connected to the annular beam. The L-shaped connecting plate (4) includes a circumferential panel and a radial panel connected to each other. The circumferential panel of the L-shaped connecting plate overlaps with the side of the web of the annular 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 annular 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 portion between the radial beam and the annular beam is not welded. In particular, an L-shaped connecting plate (4) is arranged on the left and right sides of the radial beam on the outer side of the innermost ring of the annular beam connected to the radial beam and the inner side of the outermost ring of the annular beam connected to the radial beam, respectively. At the connection between the intermediate annular beam between the innermost ring and the outermost ring connected to the radial beam and the radial beam, an L-shaped connecting plate (4) is arranged on the inner and outer sides of the annular beam and the left and right sides of the radial beam, respectively.

2. The tank ceiling circumferential beam connection device according to claim 1, characterized in that: A plurality of radial beams (e.g., 4-8 radial beams, preferably 6 radial beams) extending from the entire outer circumference of the innermost annular beam to the inner side of the outermost annular beam are evenly spaced along the circumferential direction, and a plurality of radial beams extending from the second to last annular beam inside are respectively located between two adjacent radial beams extending from the innermost annular beam.

3. The tank ceiling circumferential beam connection device according to claim 1 or 2, characterized in that: The height of the annular beam and the radial beam is 100-200mm, preferably 110-180mm, preferably 120-150mm, and also preferably 125-130mm. The thickness of the upper and lower wing plates and the web plate is 6-12mm, preferably 7-10mm, and preferably 7.5-8.5mm respectively. The height of the web plate is 80-180mm, preferably 90-150mm, preferably 100-130mm, and preferably 110-120mm.

4. The tank ceiling radial beam connection device according to any one of claims 1 to 3, characterized in that: The radial beams and the annular beams are made of aluminum alloy.

5. The tank ceiling radial beam connection device according to any one of claims 1 to 4, characterized in that: The diameter of the outermost circle of annular beams is equal to or slightly smaller than the inner diameter of the tank. The spacing between adjacent annular beams is 1 / 4 to 1 / 8 of the inner radius of the tank, preferably about 1 / 5 to 1 / 6. The inner diameter of the innermost circle of annular beams is preferably 1 / 4 to 1 / 8 of the inner diameter of the tank, preferably about 1 / 5 to 1 / 6.

6. The tank ceiling radial beam connection device according to any one of claims 1 to 5, characterized in that: The annular beams are connected to the radial beams using detachable bolts (5), each connection point of the innermost annular beam connected to the radial beam and the outermost annular beam is connected using two L-shaped connection plates, and the connection points of the middle annular beams are connected using four L-shaped connection plates.

7. The tank ceiling circumferential beam connection device according to claim 6, characterized in that: A hole is opened on the circumferential panel of the L-shaped connecting plate, and two holes are opened on the radial panel of the L-shaped connecting plate at intervals, with a hole diameter of φ15-25 mm, for example φ18 mm. Holes are opened at corresponding positions of the annular beam and the radial beam, and bolts (5) are fixed with nuts after passing through the holes on the radial beam and the L-shaped connecting plates on both sides of the radial beam, and bolts (5) are fixed with nuts after passing through the holes on the annular beam and the holes on the L-shaped connecting plates on one side or both sides of the annular beam.

8. The tank ceiling radial beam connection device according to any one of claims 1 to 7, characterized in that: The length, height and thickness of the L-shaped connecting plate are 120-200×60-100×4-10 mm, preferably 150×80×5 mm.

9. The tank ceiling circumferential beam connection device according to claim 7, characterized in that: The bolts and nuts are stainless steel bolts and nuts of specification M16.

10. The tank ceiling circumferential beam connection device according to claim 7, characterized in that: A hole is opened in the middle position of the circumferential panel of the L-shaped connecting plate, and two holes are opened at intervals on the radial panel of the L-shaped connecting plate, one of the holes is located near the intersection of the center lines of the length and width directions of the radial panel or slightly offset from the center intersection to the side of the connection point between the radial beam and the annular beam, and the other hole is located on the side away from the connection point between the radial beam and the annular beam, at the middle position between the hole close to the connection point and the end of the radial panel.

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