Film tank ceiling structure and film tank

Abstract

The present application provides a membrane tank ceiling structure and a membrane tank, including a central ceiling piece and a plurality of outriggers distributed circumferentially around the central ceiling piece, the first end of each outrigger is movably connected to the central ceiling piece, the first end of each outrigger has an abutment surface, and each outrigger has an extended state and a folded state; the second end of the outrigger extends in a direction away from the center of the central ceiling piece, and the entire outrigger extends along the plane where the central ceiling piece is located, and the abutment surface abuts the central ceiling piece to form an extended state of the outrigger; the second end of the outrigger folds back in a direction close to the center of the central ceiling piece to form a folded state of the outrigger; wherein the first end of the outrigger and the second end of the outrigger are opposite ends of the extension direction of the outrigger. The present application can reduce the construction difficulty and risk factor when welding the top of the tank wall of the inner tank.

Description

Technical Field

[0001] The present application relates to the technical field of storage tanks, and in particular to a membrane tank ceiling structure and a membrane tank. Background Art

[0002] Cryogenic liquid medium storage tanks are used to store LNG (liquefied natural gas), liquid ethylene, liquid ethane, liquid propane, liquid ammonia, etc., and are generally composed of an inner tank, an outer tank, and a cold insulation layer. The inner tank is used to store cryogenic liquid media, and the top, bottom, and tank wall of the inner tank are all wrapped in a cold insulation layer. The outer tank includes an outer tank wall and a dome, the dome is fixed to the top of the outer tank wall, and the ceiling on the top of the inner tank is suspended on the steel structure of the dome.

[0003] In the related technology, the ceiling is mainly composed of a frame beam, a hanger and a support plate. The frame beam is connected to the dome through the hanger, and the support plate is fixed on the top of the frame beam. The top of the tank wall of the inner tank of the membrane type storage tank (referred to as membrane tank) should be higher than the plane where the frame beam is located, and connected to the compression ring of the dome to ensure the good air tightness of the inner tank. During construction, a construction gap has been reserved between the outer edge of the frame beam and the inner wall of the outer tank. The construction workers pass through the construction gap at high altitude to weld the top of the tank wall of the inner tank above the frame beam. After welding and testing are completed, materials need to be transported from high altitude to fill the reserved construction gap and cover it with a cold insulation layer.

[0004] However, the ceiling structure of the above technical solution increases the construction difficulty and risk factor when welding the top of the tank wall of the inner tank of the membrane tank. Summary of the invention

[0005] In view of the above problems, the present application provides a membrane tank ceiling structure and a membrane tank, which can reduce the construction difficulty and risk factor when welding the top of the tank wall of the inner tank.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a film tank ceiling structure, comprising a central ceiling piece and a plurality of outriggers distributed circumferentially around the central ceiling piece, wherein a first end of each outrigger is movably connected to the central ceiling piece, and a first end of each outrigger has an abutment surface, and each outrigger has an extended state and a folded state;

[0008] The second end of the outrigger beam extends in a direction away from the center of the central ceiling piece, and the entire outrigger beam extends along the plane where the central ceiling piece is located, and the abutting surface abuts against the central ceiling piece to form the extended state of the outrigger beam;

[0009] The second end of the outrigger beam is folded back toward the center of the central ceiling piece to form the folded state of the outrigger beam;

[0010] Wherein, the first end of the cantilever beam and the second end of the cantilever beam are two opposite ends in the extension direction of the cantilever beam.

[0011] In a feasible implementation manner, the outrigger beam is hinged to the central ceiling piece, and a hinge axis between the outrigger beam and the central ceiling piece is parallel to a plane where the central ceiling piece is located.

[0012] In an achievable implementation, the first end of the outrigger beam is hinged to an edge position of the top of the central ceiling member through a hinge;

[0013] When the outrigger beam is in the extended state, the abutment surface abuts against the edge side surface of the central ceiling component.

[0014] In a feasible implementation, the edge side surface and the abutting surface are both inclined; the edge side surface and the bottom edge of the abutting surface are both inclined toward a side away from the center of the central ceiling piece.

[0015] In one practicable implementation, a guide structure is provided between the outrigger beam and the central ceiling member;

[0016] The guide structure is arranged at the edge side surface, and when the outrigger beam is in the extended state, the portion of the outrigger beam close to the abutment surface is inserted into the guide structure, and the guide structure is fixedly connected to the outrigger beam;

[0017] Alternatively, the guide structure is disposed at the abutment surface, and when the outrigger beam is in the extended state, a portion of the central ceiling piece close to the edge side is inserted into the guide structure, and the guide structure is fixedly connected to the central ceiling piece.

[0018] In an achievable embodiment, a hinged plate is provided on one of the top of the outrigger beam and the top of the central ceiling member, and a pair of ear plates spaced apart are provided on the other of the top of the outrigger beam and the top of the central ceiling member;

[0019] The hinge plate is inserted between the paired ear plates, and hinge holes are provided on the hinge plate and the ear plates, and the hinge member is passed through the hinge holes of the hinge plate and the ear plates.

[0020] In one feasible embodiment, the central ceiling piece includes a plurality of radial beams extending in a radial direction of the central ceiling piece, the number of the outrigger beams is equal to the number of the radial beams, and the outrigger beams are movably connected one-to-one to one end of the radial beams away from the center of the central ceiling piece.

[0021] In an achievable embodiment, it further comprises a suspension rod, wherein the suspension rod is connected to the top of the central ceiling member;

[0022] A positioning hole is provided at a position of the outrigger beam close to the second end. When the outrigger beam is in the folded state, a positioning rope is connected between the positioning hole and the suspension rod.

[0023] In one possible implementation, the second end of the cantilever beam has a rounded chamfer;

[0024] And / or, the membrane tank ceiling structure further includes a plurality of support plates, and the support plates are fixed to both the central ceiling member and the outrigger beams.

[0025] A second aspect of the embodiments of the present application provides a film tank, comprising a dome and the above-mentioned film tank ceiling structure, wherein one end of a suspension rod of the film tank ceiling structure away from the central ceiling piece is connected to the dome.

[0026] The membrane tank ceiling structure and membrane tank provided in the embodiments of the present application. The membrane tank ceiling structure includes a central ceiling piece and an outrigger beam. The outrigger beam is movably connected to the central ceiling piece, and the outrigger beam has an extended state and a folded state. When it is necessary to carry out the membrane plate welding operation on the top of the inner tank, the outrigger beam is placed in the folded state to provide the necessary construction gap for the construction hanging basket to pass through. After the membrane plate welding operation on the top of the inner tank is completed, the outrigger beam is placed in the extended state, and the outrigger beam is extended along the plane where the central ceiling piece is located to fill the construction gap; moreover, the abutment surface of the central ceiling piece abutting the outrigger beam not only realizes the reliable positioning of the outrigger beam, but also further strengthens the supporting capacity of the outrigger beam, ensuring that the design meets the load-bearing capacity required by the specification.

[0027] The embodiment of the present application flexibly connects the outrigger beam with the central ceiling piece, and by unfolding or retracting the outrigger beam, the diameter of the membrane tank ceiling structure can be adjusted and changed, which can not only meet the requirement of reserving a construction gap during the membrane plate construction phase, but also automatically fill the construction gap between the inner wall of the outer tank and the outer edge of the central ceiling piece, avoiding damage to the inner tank due to collision during the construction process, thereby ensuring the airtightness and safety of the entire membrane tank.

[0028] The embodiment of the present application has a simple structure, is easy to manufacture, construct, operate and maintain, saves materials, does not increase the total weight of the membrane tank ceiling structure, greatly reduces the amount of high-altitude construction work, and improves the reliability of the membrane tank.

[0029] The construction of the present application as well as its other objects and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of the membrane tank ceiling structure provided for the related art (suspender rods and support plates omitted);

[0032] Figure 2 A schematic diagram of the folded state of the membrane tank ceiling structure provided in an embodiment of the present application (the suspension rod and the support plate are omitted);

[0033] Figure 3 A schematic diagram of the extended state of the membrane tank ceiling structure provided in an embodiment of the present application (the suspension rod and the support plate are omitted);

[0034] Figure 4 A schematic diagram of the structure of the membrane tank ceiling structure provided in an embodiment of the present application, in which the outrigger beam is in a folded state;

[0035] Figure 5 for Figure 4 The main view (including the boom);

[0036] Figure 6 for Figure 4 C-direction view;

[0037] Figure 7 for Figure 4 A partial enlarged view of the connection of the cantilever beam;

[0038] Figure 8 A schematic structural diagram of an outrigger beam of a membrane tank ceiling structure provided by an embodiment of the present application in an extended state;

[0039] Fig. 9 for Figure 8 The main view of the (including the hanger and support plate).

[0040] Description of reference numerals:

[0041] 110'-frame beam;

[0042] 100-film tank ceiling structure;

[0043] 110-central ceiling piece; 1100-central ring; 1101-multiple frames; 111-radial beams; 112-ring beams; 113-edge sides; 114-ear plates; 115-guide structures; 1151-guide fixing holes; 1152-pin shafts;

[0044] 120-extension beam; 121-abutment surface; 122-hinged plate; 1221-hinged member; 123-fixing hole; 124-positioning rope; 125-positioning hole;

[0045] 130- boom;

[0046] 140-Support plate. DETAILED DESCRIPTION

[0047] In the related art, the suspended ceiling of a cryogenic liquid medium storage tank is a load-bearing structure suspended on the dome of an outer tank to support cold-keeping and heat-insulating materials to reduce the cold transfer between the cryogenic medium and the external heat source.

[0048] Reference Figure 1 As shown, the ceiling is mainly composed of a frame beam 110', a hanger (not shown) and a support plate (not shown). The frame beam 110' is a structure in which multiple frames 1101 surround a central shape 1100. The central shape 1100 can be a ring or polygonal frame structure. The multiple frames 1101 include a plurality of ring beams 112 and a plurality of radial beams 111. Each ring beam 112 surrounds the outer periphery of the central shape 1100, and a plurality of ring beams 112 are spaced apart along the radial direction of the central shape 1100. Each radial beam 111 extends outwardly from the outer periphery of the central shape 1100 in a radial direction, and a plurality of radial beams 111 are spaced apart along the circumference of the central shape 1100. The radial beams 111 and the ring beams 112 intersect with each other, and the intersection of the two is rigidly connected. The hanger is connected between the dome and the frame beam, and the hanger can be provided with a two-way adjustment head with a thread, which is used to adjust the horizontality of the plane where the frame beam is located during the installation process. The support plate is riveted to the top of the frame beam and is used to lay the cold and heat insulation materials.

[0049] After the ceiling construction is finalized, there is a large gap (up to 2m) between the outer edge of the frame beam and the inner wall of the outer tank. For single-volume storage tanks, double-volume storage tanks and full-volume storage tanks, the tank wall of the inner tank is located below the ceiling, and the subsequent construction of the inner tank will not interfere with the ceiling that is lifted into place. Therefore, after the ceiling construction is completed, it is only necessary to fill the gap between the outer edge of the frame beam and the inner wall of the outer tank with cold insulation materials.

[0050] For membrane tanks, the top of the inner tank wall (membrane plate) must be higher than the plane of the frame beam and connected to the compression ring of the dome to ensure good airtightness of the inner tank. When welding the membrane plate, both the construction workers and the membrane plate need to pass through the frame beam, so a wide enough operating space needs to be reserved for them. When using the ceiling in the relevant technology to weld the membrane plate, the ceiling processing of "reserving gaps" and "filling gaps" needs to be performed separately. The overall processing process of the ceiling is briefly described as follows:

[0051] First, after the outer tank wall of the membrane tank is constructed, the dome and ceiling are made inside the outer tank wall. A construction gap of 1.8 to 2.5 meters is reserved between the outer edge of the frame beam and the inner wall of the outer tank.

[0052] Secondly, the suspended ceiling is lifted together with the dome to a height of about 40 meters, and the dome is welded to the outer tank wall.

[0053] Then, after the ceiling is in place and finalized, the inner tank is constructed inside the outer tank wall. When the construction reaches the top of the inner tank wall, the construction workers and the film sheet are hoisted through the construction gap by the construction hanging basket, and the construction workers weld the film sheet in the air.

[0054] Finally, after welding is completed, the gap filling materials will be transported to the top of the frame beam, and the frame beam will be connected by welding, riveting and other methods to fill the construction gap (a necessary gap of about 0.5 meters can be retained), and support plates and cold insulation materials will be laid on the filled frame beam.

[0055] In order to achieve the design requirements of "reserving gaps" and "filling gaps" at the same time, the above technical solution requires two processing of the ceiling. Especially during the second processing (connecting the frame beam), the area to fill the construction gap should have sufficient bearing capacity, which requires a lot of work to be completed at a height of 40 meters. There are a series of problems such as high-altitude material lifting, parts welding, and plate laying. The construction is difficult and the risk factor is high. It not only affects the safety of construction workers, but also the bumps during the construction process are very likely to cause damage to the thin film plate, destroying the airtightness and safety of the entire film tank.

[0056] In view of the above technical problems, the embodiments of the present application provide a membrane tank ceiling structure and a membrane tank. The membrane tank ceiling structure includes a central ceiling piece and an outrigger beam. The outrigger beam is movably connected to the central ceiling piece, and the outrigger beam has an extended state and a folded state. When it is necessary to carry out the membrane plate welding operation on the top of the inner tank, the outrigger beam is placed in the folded state to provide the necessary construction gap for the construction hanging basket to pass through. After the membrane plate welding operation on the top of the inner tank is completed, the outrigger beam is placed in the extended state, and the outrigger beam extends along the plane where the central ceiling piece is located to fill the construction gap; moreover, the abutment surface of the central ceiling piece abuts against the outrigger beam, which not only realizes the reliable positioning of the outrigger beam, but also further strengthens the supporting capacity of the outrigger beam, ensuring that the design meets the load-bearing capacity required by the specification.

[0057] The embodiment of the present application flexibly connects the outrigger beam with the central ceiling piece, and by unfolding or retracting the outrigger beam, the diameter of the membrane tank ceiling structure can be adjusted and changed, which can not only meet the requirement of reserving a construction gap during the membrane plate construction phase, but also automatically fill the construction gap between the inner wall of the outer tank and the outer edge of the central ceiling piece, avoiding damage to the inner tank due to collision during the construction process, thereby ensuring the airtightness and safety of the entire membrane tank.

[0058] The embodiment of the present application has a simple structure, is easy to manufacture, construct, operate and maintain, saves materials, does not increase the total weight of the membrane tank ceiling structure, greatly reduces the amount of high-altitude construction work, and improves the reliability of the membrane tank.

[0059] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0060] Reference Figure 2-Figure 9 As shown, in the first aspect, the embodiment of the present application provides a film tank ceiling structure 100, including a central ceiling piece 110 and a plurality of outrigger beams 120 distributed circumferentially around the central ceiling piece 110, the first end of each outrigger beam 120 is movably connected to the central ceiling piece 110, and the first end of each outrigger beam 120 has an abutment surface 121, and each outrigger beam 120 has an extended state and a folded state.

[0061] The second end of the outrigger beam 120 extends in a direction away from the center of the central ceiling piece 110 , and the entire outrigger beam 120 extends along the plane where the central ceiling piece 110 is located, and the abutting surface 121 abuts against the central ceiling piece 110 , forming an extended state of the outrigger beam 120 .

[0062] The second end of the outrigger beam 120 is folded back toward the center of the central ceiling piece 110 , forming a folded state of the outrigger beam 120 .

[0063] The first end of the cantilever beam 120 and the second end of the cantilever beam 120 are two opposite ends in the extension direction of the cantilever beam 120 .

[0064] In the embodiment of the present application, the central ceiling member 110 may be a frame beam 110' structure in the related art, or may be a circular flat plate structure (for example, an aluminum plate, a stainless steel plate, etc.), or may be a frame beam structure with longitudinal and transverse beams arranged in the longitude and latitude. The diameter of the central ceiling member 110 should be smaller than the inner diameter of the inner tank to form a sufficient reserved construction gap.

[0065] The outrigger beam 120 itself needs to meet certain support capacity, and the support capacity of the outrigger beam 120 can be further enhanced by the abutment of the abutment surface 121 with the central ceiling member 110. For example, the outrigger beam 120 can be made of steel, such as I-beam, H-steel, T-steel, channel steel, etc.

[0066] The connection method between the central ceiling member 110 and the outrigger beam 120 may include a hinge connection, a pin connection or an articulated bolt connection, so that the outrigger beam 120 can relatively easily realize the transformation between the extended state and the folded state.

[0067] The membrane tank ceiling structure 100 provided in the embodiment of the present application includes a central ceiling piece 110 and an outrigger beam 120. The outrigger beam 120 is movably connected to the central ceiling piece 110, and the outrigger beam has an extended state and a folded state. When it is necessary to perform the membrane plate welding operation on the top of the inner tank, the outrigger beam 120 is placed in the folded state to provide the necessary construction gap for the construction hanging basket to pass through. After the membrane plate welding operation on the top of the inner tank is completed, the outrigger beam 120 is placed in the extended state, and the outrigger beam 120 extends along the plane where the central ceiling piece 110 is located, filling the construction gap; moreover, the abutment surface 121 of the central ceiling piece 110 abuts against the outrigger beam 120, which not only realizes the reliable positioning of the outrigger beam, but also further strengthens the supporting capacity of the outrigger beam 120, ensuring that the design meets the load-bearing capacity required by the specification.

[0068] The embodiment of the present application flexibly connects the outrigger beam 120 with the central ceiling piece 110. By unfolding or retracting the outrigger beam, the diameter of the membrane tank ceiling structure 100 can be adjusted and varied, which can not only meet the requirement of reserving a construction gap during the membrane plate construction phase, but also automatically fill the construction gap between the inner wall of the outer tank and the outer edge of the central ceiling piece 110, thereby avoiding damage to the inner tank during the construction process and ensuring the airtightness and safety of the entire membrane tank.

[0069] The embodiment of the present application has a simple structure, is easy to manufacture, construct, operate and maintain, saves materials, does not increase the total weight of the membrane tank ceiling structure, greatly reduces the amount of high-altitude construction work, and improves the reliability of the membrane tank.

[0070] In one possible implementation, referring to Figure 2 and Figure 3 As shown, the central ceiling piece 110 includes a plurality of radial beams 111 extending along the radial direction of the central ceiling piece 110 , the number of the outrigger beams 120 is equal to the number of the radial beams 111 , and the outrigger beams 120 are movably connected one by one to one end of the radial beams 111 away from the center of the central ceiling piece 110 .

[0071] In this way, the frame beam 110' in the related technology can be directly used as the central ceiling member 110, and the cantilever beam 120 can be made of steel sections. Then, the central ceiling member 110 and the cantilever beam 120 can be flexibly connected through the following connecting parts such as hinge bolts and pins. The frame beam 110' can be improved into a membrane tank ceiling structure 100 through more than ten common parts, making full use of existing resources.

[0072] In one possible implementation, referring to Figure 2-Figure 3 As shown, the outrigger beam 120 is hinged to the central ceiling piece 110, and the hinge axis between the outrigger beam 120 and the central ceiling piece 110 is parallel to the plane where the central ceiling piece is located.

[0073] In this way, the outrigger beam 120 can be freely retracted and extended in the axial plane of the central ceiling piece 110, and the gravity of the outrigger beam 120 can be utilized to make the outrigger beam 120 fall naturally to form an extended state without consuming more construction operations by construction workers.

[0074] In one possible implementation, referring to Figure 4-Figure 8 As shown, the first end of the outrigger beam 120 is hinged to the central ceiling member ( Figure 4-Figure 8 Only the radial beam 111 of the central ceiling component is shown in the figure. When the outrigger beam 120 is in the extended state, the abutment surface 121 abuts against the edge side surface 113 of the central ceiling component.

[0075] In this way, the edge side surface 113 of the central ceiling component is used to abut the abutment surface 121 of the cantilever beam 120, and the edge side surface 113 and the abutment surface 121 have a larger contact area, which improves the positioning and supporting ability of the central ceiling component on the cantilever beam 120 and improves the stability and supporting strength of the overall structure.

[0076] In some embodiments, the outrigger beam 120 is hinged to the edge side of the central ceiling piece 110 through a hinge; when the outrigger beam 120 is in an extended state, the abutting surface 121 abuts against the bottom surface of the central ceiling piece 110 .

[0077] In this way, by using the bottom surface of the central ceiling component 110 to abut against the abutting surface of the outrigger beam 120, the positioning and supporting capabilities of the central ceiling component 110 on the outrigger beam 120 can also be improved, thereby improving the stability and supporting strength of the overall structure.

[0078] In one possible implementation, referring to Figure 5 and Figure 7 As shown, the edge side surface 113 and the abutting surface 121 are both inclined. The bottom edges of the edge side surface 113 and the abutting surface 121 are both inclined toward a side away from the center of the central ceiling piece 110 .

[0079] The edge side surface 113 is a beveled structure, and the edge side surface 113 is inclined from top to bottom toward the direction extending toward the periphery of the central ceiling component 110. It can be understood that when the outrigger beam 120 is in the extended state, the entire surface of the abutment surface 121 abuts against the edge side surface 113, and the abutment surface 121 is also a beveled structure, and the abutment surface 121 is also inclined from top to bottom toward the direction extending toward the periphery of the central ceiling component 110.

[0080] When the outrigger beam 120 is a steel section, the abutment surface 121 may be a chamfered section of the steel section. Exemplarily, the outrigger beam 120 is an I-beam, and the abutment surface 121 is formed by obliquely cutting along the I-beam section of the I-beam. When the central ceiling member 110 is a frame beam 110', and the radial beam 111 of the central ceiling member 110 is hinged to the outrigger beam 120, the radial beam 111 may also be made of steel section, and the radial beam 111 has a chamfered section complementary to the outrigger beam 120.

[0081] In this way, the edge side surface 113 not only positions the abutting surface 121 , but also transmits the supporting force of the central ceiling component 110 to the cantilever beam 120 , thereby improving the stability and supporting strength of the cantilever beam 120 .

[0082] In one possible implementation, referring to Figure 5 and Figure 8 As shown, a guide structure 115 is provided between the outrigger beam 120 and the central ceiling member 110 .

[0083] The guide structure 115 can guide and limit the outrigger beam 120. The guide structure 115 can be a guide side plate or a guide groove. In the embodiment of the present application, the guide structure 115 is two guide side plates arranged relatively along the circumference of the central ceiling member 110. The two guide side plates can be fixed by welding or by bolts.

[0084] In one possible implementation, refer to Figure 5 and Figure 8 As shown, the guide structure 115 is disposed at the edge side 113 , and when the outrigger beam 120 is in an extended state, a portion of the outrigger beam 120 close to the abutment surface 121 is inserted into the guide structure 115 , and the guide structure 115 is fixedly connected to the outrigger beam 120 .

[0085] A guide side plate is fixed on each side of the edge side 113, and the guide side plate has an extended section away from the edge side 113, and a plurality of guide fixing holes 1151 are provided on the extended section. In the embodiment of the present application, three guide fixing holes 1151 are arranged in an equilateral triangle on the extended section. A fixing hole 123 corresponding to the guide fixing hole 1151 is provided on the portion of the extended beam 120 close to the abutting surface 121.

[0086] When the outrigger beam 120 is in an extended state, the abutment surface 121 of the outrigger beam 120 abuts against the edge side surface 113 of the central ceiling member 110, and the portion of the outrigger beam 120 close to the abutment surface 121 is inserted between the two guide side plates, and a fixing member is connected between the fixing hole 123 and the guide fixing hole 1151. The fixing member may be a pin 1152 and a cotter pin. One end of the pin 1152 has a large end portion, and the other end of the pin 1152 is provided with a tail pin hole. The large end portion of the pin 1152 abuts against one of the guide side plates, the middle portion of the pin 1152 is inserted into the fixing hole and the guide fixing hole, the tail portion of the pin 1152 passes through another guide side plate, and the tail pin hole is located on the outside of the guide side plate. The split pin is inserted into the tail pin hole of the pin shaft 1152, and the opening angle of the two pin legs of the split pin is greater than 180°. The split pin legs must be wrapped around the pin shaft so that the arc surface of the split part is parallel to the arc surface of the pin shaft 1152 and as close to the pin shaft 1152 as possible. The pin shaft 1152 and the split pin can be quickly assembled manually, which can minimize the time of high-altitude operations. In some embodiments, the fixing member can also include a bolt.

[0087] In another feasible embodiment, the guide structure 115 is arranged at the abutment surface 121, and when the cantilever beam 120 is in an extended state, the portion of the central ceiling piece 110 close to the edge side 113 is inserted into the guide structure 115, and the guide structure 115 is fixedly connected to the central ceiling piece 110.

[0088] This assembly method is similar to the above-mentioned assembly form in which the guide structure 115 is arranged on the edge side surface 113, and will not be described in detail.

[0089] In this way, the guide structure 115 guides and limits the outrigger beam 120, and the guide structure 115 realizes a fixed connection between the outrigger beam 120 and the central ceiling member 110, thereby improving the stability of the outrigger beam 120 in the extended state.

[0090] In one possible implementation, referring to Figure 6-Figure 8 As shown, a hinge plate 122 is disposed on the top of the outrigger beam 120 , and a pair of ear plates 114 disposed at intervals are disposed on the top of the central ceiling member 110 .

[0091] The hinge plate 122 is inserted between the paired ear plates 114 . Both the hinge plate 122 and the ear plates 114 are provided with hinge holes, and hinged parts are passed through the hinge holes of the hinge plate 122 and the ear plates 114 .

[0092] Among them, the hinge can be as follows Figure 6 The hinge bolt shown may also be a pin. The ear plate 114 and the hinge plate 122 are used as the support member of the hinge, which provides a larger bending section modulus for the hinge and improves the strength and rigidity of the hinge.

[0093] It is understandable that if Figure 7 As shown, in order to allow the outrigger beam 120 to be freely retracted and extended, a reasonable cutting angle can be selected so that all rotating parts rotating around the hinge can just avoid each other, avoiding collision and interference, and the overall structure is simple and efficient.

[0094] In some embodiments, a hinge plate 122 may be optionally provided on the top of the central ceiling member 110, and pairs of spaced ear plates 114 may be provided on the top of the outrigger beam 120, which may also achieve the beneficial effect of improving the strength and rigidity of the hinge.

[0095] In one possible implementation, referring to Figure 5 As shown, the film tank ceiling structure 100 also includes a suspension rod 130, which is connected to the top of the central ceiling member 110. A positioning hole 125 is provided near the second end of the outrigger beam 120, and a positioning rope 124 is connected between the positioning hole 125 and the suspension rod 130 when the outrigger beam 120 is in a folded state.

[0096] The suspension rod 130 may be provided with a two-way adjustment head with a thread, which is used to adjust the horizontality of the plane where the central ceiling piece is located during the installation process. The positioning hole 125 may be opened on the side of the extension beam 120 close to the suspension rod 130, and the positioning rope 124 may be a steel wire. When welding construction is required, the extension beam 120 is placed in a folded state, and the second end of the extension beam 120 is tied to the suspension rod 130 through the positioning rope 124, which can prevent the extension beam 120 from falling accidentally due to gravity.

[0097] In some embodiments, when the outrigger beam 120 is in an extended state, an auxiliary rope may be connected between the positioning hole 125 and the dome to improve the support of the outrigger beam 120 .

[0098] In one possible implementation, referring to Figure 4 and 8 As shown, the second end of the outrigger beam 120 has a round chamfer. In this way, it is possible to avoid the end of the outrigger beam 120 from damaging the membrane plate of the membrane tank.

[0099] In one possible implementation, referring to Fig. 9 As shown, the membrane tank ceiling structure 100 further includes a plurality of support plates 140 , and the support plates 140 are fixed to the central ceiling member 110 and the outrigger beams 120 .

[0100] The support plate 140 can be a flat plate, a corrugated plate, a reinforced plate, or a combination of one or more of the above. Fig. 9As shown, the support plate 140 on the central ceiling member 110 is a corrugated plate, and the support plate 140 on the outrigger beam 120 is a flat plate. The support plate 140 can be fixed by blind rivets, welding or bolts.

[0101] In this way, the support plate 140 provides a laying plane for the cold-insulating material, and the support plate 140 can evenly transfer the gravity of the cold-insulating material to the central ceiling member 110 and the outrigger beam 120 .

[0102] In a second aspect, an embodiment of the present application provides a film tank, including a dome and the above-mentioned film tank ceiling structure 100, wherein one end of a suspension rod 130 of the film tank ceiling structure 100 away from a central ceiling piece 110 is connected to the dome.

[0103] Among them, other features of the membrane tank ceiling structure 100 are consistent with the above and will not be repeated.

[0104] The membrane tank provided in the embodiment of the present application includes a dome and a membrane tank ceiling structure 100. The membrane tank ceiling structure 100 includes a central ceiling piece 110 and an outrigger beam 120. The outrigger beam 120 is movably connected to the central ceiling piece 110, and the outrigger beam has an extended state and a folded state. When it is necessary to perform the membrane plate welding operation on the top of the inner tank, the outrigger beam 120 is placed in a folded state to provide the necessary construction gap for the construction hanging basket to pass through. After the membrane plate welding operation on the top of the inner tank is completed, the outrigger beam 120 is placed in an extended state, and the outrigger beam 120 extends along the plane where the central ceiling piece 110 is located, filling the construction gap; moreover, the central ceiling piece 110 abuts against the abutment surface 121 of the outrigger beam 120, which not only realizes the reliable positioning of the outrigger beam, but also further strengthens the supporting capacity of the outrigger beam 120, ensuring that the design meets the bearing capacity required by the specification.

[0105] The embodiment of the present application flexibly connects the outrigger beam 120 with the central ceiling piece 110. By unfolding or retracting the outrigger beam, the diameter of the membrane tank ceiling structure 100 can be adjusted and varied, which can not only meet the requirement of reserving a construction gap during the membrane plate construction phase, but also automatically fill the construction gap between the inner wall of the outer tank and the outer edge of the central ceiling piece 110, thereby avoiding damage to the inner tank during the construction process and ensuring the airtightness and safety of the entire membrane tank.

[0106] The embodiment of the present application has a simple structure, is easy to manufacture, construct, operate and maintain, saves materials, does not increase the total weight of the membrane tank ceiling structure, greatly reduces the amount of high-altitude construction work, and improves the reliability of the membrane tank.

[0107] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0108] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0109] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A film tank ceiling structure, It is characterized in that It comprises a central ceiling piece and a plurality of outriggers distributed circumferentially around the central ceiling piece, wherein the first end of each outrigger is movably connected to the central ceiling piece, and the first end of each outrigger has an abutment surface, and each outrigger has an extended state and a folded state; The second end of the outrigger beam extends in a direction away from the center of the central ceiling piece, and the entire outrigger beam extends along the plane where the central ceiling piece is located, and the abutting surface abuts against the central ceiling piece to form the extended state of the outrigger beam; The second end of the outrigger beam is folded back toward the center of the central ceiling piece to form the folded state of the outrigger beam; Wherein, the first end of the cantilever beam and the second end of the cantilever beam are two opposite ends in the extension direction of the cantilever beam; The outrigger beam is hinged to the central ceiling piece, and the hinge axis of the outrigger beam and the central ceiling piece is parallel to the plane where the central ceiling piece is located; The first end of the outrigger beam is hinged to the edge of the top of the central ceiling member through a hinge; When the outrigger beam is in the extended state, the abutment surface abuts against the edge side of the central ceiling piece; The edge side surface and the abutting surface are both inclined; the edge side surface and the bottom edge of the abutting surface are both inclined toward a side away from the center of the central ceiling piece.

2. The film tank ceiling structure according to claim 1, It is characterized in that A guide structure is provided between the outrigger beam and the central ceiling member; The guide structure is arranged at the edge side surface, and when the outrigger beam is in the extended state, the portion of the outrigger beam close to the abutment surface is inserted into the guide structure, and the guide structure is fixedly connected to the outrigger beam; Alternatively, the guide structure is disposed at the abutment surface, and when the outrigger beam is in the extended state, a portion of the central ceiling piece close to the edge side is inserted into the guide structure, and the guide structure is fixedly connected to the central ceiling piece.

3. The film tank ceiling structure according to claim 1, It is characterized in that A hinged plate is disposed on one of the top of the outrigger beam and the top of the central ceiling piece, and a pair of ear plates disposed at intervals are disposed on the other of the top of the outrigger beam and the top of the central ceiling piece; The hinge plate is inserted between the paired ear plates, and hinge holes are provided on the hinge plate and the ear plates, and the hinge member is passed through the hinge holes of the hinge plate and the ear plates.

4. The film tank ceiling structure according to any one of claims 1 to 3, It is characterized in that The central ceiling piece includes a plurality of radial beams extending in the radial direction of the central ceiling piece, the number of the outrigger beams is equal to the number of the radial beams, and the outrigger beams are movably connected one by one to one ends of the radial beams away from the center of the central ceiling piece.

5. The film tank ceiling structure according to any one of claims 1 to 3, It is characterized in that Also included is a suspension rod connected to the top of the central ceiling member; A positioning hole is provided at a position of the outrigger beam close to the second end. When the outrigger beam is in the folded state, a positioning rope is connected between the positioning hole and the suspension rod.

6. The film tank ceiling structure according to any one of claims 1 to 3, It is characterized in that The second end of the outrigger beam has a rounded chamfer; And / or, the membrane tank ceiling structure further includes a plurality of support plates, and the support plates are fixed to both the central ceiling member and the outrigger beams.

7. A film tank, It is characterized in that It comprises a dome and the film tank ceiling structure according to any one of claims 1 to 6, wherein one end of the suspension rod of the film tank ceiling structure away from the central ceiling piece is connected to the dome.

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