阅读说明：本技术 低温常压储罐 (Low-temperature normal-pressure storage tank ) 是由 郭旭 罗晓钟 王荣华 王芳云 陈杰 孟树森 李冠军 于 2018-07-18 设计创作，主要内容包括：本发明提供了一种低温常压储罐,包括底部绝热层、位于底部绝热层上的内罐、覆盖于内罐侧壁外表面的弹性棉组件；弹性棉组件通过固定组件与所述内罐连接固定；固定组件包括上部固定件、底部固定件和绑扎带；上部固定件包括夹持单元和挂钩；夹持单元沿弹性棉组件上缘延伸设置,并固定夹持弹性棉组件的上端；挂钩与夹持单元连接固定,并挂接固定于内罐上；底部固定件预埋于底部绝热层中,沿内罐周向间隔布置；绑扎带沿内罐周向间隔布置有多个；各绑扎带在高度方向上倾斜设置,并张紧贴合于弹性棉组件的外表面,绑扎带上端固定于上部固定件上,下端固定于底部固定件上。本发明的储罐中,弹性棉组件稳定性高,整体成本低,施工安全性高。(The invention provides low-temperature normal-pressure storage tanks, which comprise a bottom heat insulation layer, an inner tank positioned on the bottom heat insulation layer and an elastic cotton assembly covering the outer surface of the side wall of the inner tank, wherein the elastic cotton assembly is fixedly connected with the inner tank through a fixing assembly, the fixing assembly comprises an upper fixing piece, a bottom fixing piece and binding belts, the upper fixing piece comprises a clamping unit and hooks, the clamping unit extends along the upper edge of the elastic cotton assembly and fixedly clamps the upper end of the elastic cotton assembly, the hooks are fixedly connected with the clamping unit and fixedly hooked on the inner tank, the bottom fixing piece is embedded in the bottom heat insulation layer and arranged at intervals along the circumferential direction of the inner tank, the binding belts are obliquely arranged in the height direction and tightly attached to the outer surface of the elastic cotton assembly, the upper ends of the binding belts are fixed on the upper fixing piece, and the lower ends of the binding belts are fixed on the bottom fixing piece.)

The low-temperature normal-pressure storage tank comprises a bottom heat insulation layer, an inner tank positioned on the bottom heat insulation layer and an elastic cotton assembly covering the outer surface of the side wall of the inner tank, and is characterized in that the elastic cotton assembly is fixedly connected with the inner tank through a fixing assembly;

the fixing assembly includes:

an upper fixing member including a clamping unit and a hook; the clamping unit extends along the upper edge of the elastic cotton assembly and fixedly clamps the upper end of the elastic cotton assembly; the hook is fixedly connected with the clamping unit and fixedly connected to the inner tank in a hanging manner;

the bottom fixing pieces are pre-embedded in the bottom heat insulation layer and are arranged at intervals along the circumferential direction of the inner tank;

a plurality of binding belts are arranged at intervals along the circumferential direction of the inner tank; each binding belt is obliquely arranged in the height direction and is tensioned and attached to the outer surface of the elastic cotton assembly, the upper end of each binding belt is fixed on the upper fixing piece, and the lower end of each binding belt is fixed on the bottom fixing piece.

2. The cryogenic atmospheric storage tank of claim 1, wherein the clamping unit comprises a clamping plate and a fastener; the clamping plate is respectively attached to and tightly presses the inner surface and the outer surface of the elastic cotton assembly, and the clamping plate and the elastic cotton assembly are provided with corresponding mounting holes and are fixedly connected through the fasteners.

3. The low-temperature normal-pressure storage tank is characterized in that the hook is fixedly connected with the clamping unit through a connecting plate;

the hook is welded and fixed with the connecting plate;

the connecting plate is provided with a mounting hole and is fixedly connected with the clamping plate and the elastic cotton assembly through the fastener.

4. The cryogenic atmospheric storage tank of claim 2, wherein the clamp plate is made of construction grade wood.

5. The tank of claim 2, wherein the mounting holes of the clamping plate attached to the outer surface of the elastic cotton assembly are counter bores, and the fasteners do not extend beyond the counter bores.

6. The cryogenic atmospheric storage tank of claim 1, wherein the bottom of the bottom fixture is embedded in the bottom insulating layer, and the top of the bottom fixture protrudes from the upper surface of the bottom insulating layer to be fixed by the tie.

7. The cryogenic atmospheric storage tank of claim 6, wherein closed loops are formed between the top of the bottom fixture and the bottom insulation layer surface.

8. The cryogenic atmospheric storage tank of claim 7, wherein the bottom fixing member includes a fixing portion having an inverted U-shape and wing portions bent and extended outward from both ends of a U-shaped opening of the fixing portion; the two wing parts are flush with each other and horizontally fixed in the bottom heat insulation layer.

9. The cryogenic atmospheric storage tank of claim 6 wherein the bottom insulation layer comprises a concrete screed that snugly supports the bottom of the inner tank; the bottom fixing piece is pre-buried in the concrete leveling layer.

10. The cryogenic atmospheric storage tank of any wherein the inner tank is an open-topped structure, and the hook is hung from an open-topped top edge of the inner tank.

11. The cryogenic atmospheric storage tank of any one of claims 1 to 9 to wherein the outer wall of the inner tank forms a track structure to which the hangers are attached.

12. The cryogenic atmospheric storage tank of claim 11, wherein the inner tank is a closed container and comprises a cylinder body with an open top and a top cover for covering the open top of the cylinder body; the cylinder body comprises a cylinder body main body and a compression ring positioned at the top of the cylinder body main body; the compression ring is matched with the section of the cylinder body and is fixedly butted, the thickness of the compression ring is larger than that of the cylinder body, and the compression ring is fixedly connected with the top cover;

the track structure is connected and fixed with the outer wall of the anti-pressure ring.

13. The cryogenic atmospheric storage tank of claim 11, wherein the track structure is formed by a plurality of tie plates, a plurality of bulkheads, and a plurality of track slabs; each backing plate is followed the outer wall circumference interval of inner tank sets up, and on each backing plate was fixed in to each baffle correspondence, the both ends of track board were fixed in respectively on two adjacent baffles, borrow by the thickness of baffle makes has the interval between track board and the inner tank outer wall, thereby forms the track structure.

Technical Field

The invention relates to the field of low-temperature medium storage equipment, in particular to low-temperature normal-pressure storage tanks.

Background

The low-temperature normal-pressure storage has the advantages of large storage capacity, high safety coefficient and convenience for management of a integration system , LNG and air separation media (such as liquid nitrogen, liquid oxygen and liquid argon) are stored in a large number of ways, the equipment is called as a low-temperature normal-pressure storage tank, the low-temperature normal-pressure storage tank is divided from the structural aspect and can be divided into a double-vault storage tank and an inner-suspended-roof outer-vault storage tank (namely a suspended ceiling storage tank), various aspects such as design, construction and operation are continuously explored and experience accumulated in a long -period time, the technology of the existing low-temperature normal-pressure storage tank is mature, but in the face of increasingly intensified market competition environments, products need to be optimally designed from various aspects such as design and installation, the cost is reduced on the premise.

Since 8000m³≤V＜10000m³Double vault storage tank, V is greater than or equal to 10000m³The above ceiling storage tank has a large diameter and is at normal temperature when being constructed, and the temperature of storage medium LNG (temperature-163 ℃) or air separation medium (such as LIN temperature-196 ℃) is higherThe temperature is very low, so the whole part contacted with the low-temperature medium must be completely precooled before the equipment is used for the first time, and the liquid can be stored until the corresponding temperature is reached, along with the continuous reduction of the precooling temperature, the cylinder body and the top cover of the inner tank can symmetrically contract towards the center of the storage tank, the total contraction quantity of the storage tank in the radius direction can reach 3 per mill of the radius (calculated according to the austenitic stainless steel S30408) until the storage tank is balanced, and in the continuous contraction process, the interlayer space is continuously filled with the pearl sand, if the equipment is overhauled or the storage tank does not store the low-temperature liquid for a long time, the storage tank is restored to the original initial normal temperature state from the cold state, along with the temperature rise, the stainless steel inner tank expands outwards in the radius direction, and the dense pearl sand filled in the cold state exerts acting forces opposite to the expansion direction on the cylinder body under the working condition, if a flexible structure is not arranged, the partial side pressure can.

By integrating the characteristics, the elastic cotton is arranged outside the cylinder body of the inner tank and used for offsetting the extrusion force of the pearlife to the cylinder body in the contraction or expansion process of the storage tank. Conventionally, the heat preservation nail with the reverse self-locking gasket is arranged in the range of 400mm of the longitudinal distance and 400mm of the transverse distance of the whole outer surface of the wall plate of the inner tank cylinder body (common specification: diameter)Length L140 mm, base: 50mm × 50mm, locking tab:

) The heat preservation nail is bonded on the outer surface side of the inner tank barrel through low-temperature glue, and is 10000m in single unit³About 13000 more sets of heat preservation nails and about 300kg of low-temperature glue are needed to be used by the storage tank, the total cost is about 15 ten thousand yuan, and the cost is very high. Secondly, as the filling amount of the pearlife in the interlayer is gradually increased in the filling process of the pearlife, the fluffy pearlife can continuously sink under the influence of self weight until reaching a compact state, the contact surface of the pearlife and the elastic cotton can generate friction force in the process, the elastic cotton can bear vertical downward tension under the action of the friction force, and the heat-insulating nail base bonded by low-temperature glue is very easy to open, so that the barrel is led toAnd thirdly, because the whole outer surface of the inner tank cylinder body is required to be provided with the heat-insulating nails, operators need to sequentially construct from top to bottom in the high altitude of more than 20 meters in the construction process, and the construction risk is extremely high.

Disclosure of Invention

The invention aims to provide low-temperature normal-pressure storage tanks, optimize a scheme for fixing elastic cotton in the storage tanks, improve the structural stability of the elastic cotton in the storage tanks, reduce the overall cost and improve the construction safety.

According to aspects of the invention, the low-temperature and normal-pressure storage tank comprises a bottom heat insulation layer, an inner tank located on the bottom heat insulation layer and an elastic cotton assembly covering the outer surface of the side wall of the inner tank, wherein the elastic cotton assembly is fixedly connected with the inner tank through a fixing assembly, the fixing assembly comprises an upper fixing piece, a bottom fixing piece and binding bands, the upper fixing piece comprises a clamping unit and hooks, the clamping unit extends along the upper edge of the elastic cotton assembly and fixedly clamps the upper end of the elastic cotton assembly, the hooks are fixedly connected with the clamping unit and fixedly hooked on the inner tank, the bottom fixing piece is pre-embedded in the bottom heat insulation layer and is arranged at intervals along the circumferential direction of the inner tank, a plurality of binding bands are arranged at intervals along the circumferential direction of the inner tank, each binding band is obliquely arranged in the height direction and tightly attached to the outer surface of the elastic cotton assembly, the upper end of each binding band is fixed on the upper fixing piece, and the lower end.

Preferably, the clamping unit comprises a clamping plate and a fastener; the clamping plate is respectively attached to and tightly presses the inner surface and the outer surface of the elastic cotton assembly, and the clamping plate and the elastic cotton assembly are provided with corresponding mounting holes and are fixedly connected through the fasteners.

Preferably, the hook is fixedly connected with the clamping unit through a connecting plate, the hook is fixedly welded with the connecting plate, a mounting hole is formed in the connecting plate, and the connecting plate is fixedly connected with the clamping plate and the elastic cotton assembly through the fastening piece.

Preferably, the clamping plate is made of construction grade wood.

Preferably, the mounting hole on the clamping plate attached to the outer surface of the elastic cotton assembly is a counter bore, and the fastener does not exceed the range of the counter bore.

Preferably, the bottom of the bottom fixing piece is embedded in the bottom heat insulation layer, and the top of the bottom fixing piece protrudes out of the upper surface of the bottom heat insulation layer so as to fix the binding band.

Preferably, an closed loop is formed between the top of the bottom fixture and the surface of the bottom insulation layer.

Preferably, the bottom fixing piece comprises a fixing part in an inverted U shape and wing parts bent and extended outwards from two ends of a U-shaped opening of the fixing part; the two wing parts are flush with each other and horizontally fixed in the bottom heat insulation layer.

Preferably, the bottom heat insulation layer comprises a concrete leveling layer which is attached to and supports the bottom of the inner tank; the bottom fixing piece is pre-buried in the concrete leveling layer.

Preferably, the inner tank is of a structure with an open top, and the hook is hung on the upper edge of the open top of the inner tank.

Preferably, the outer wall of the inner tank forms a track structure, and the hook is hung on the track structure.

Preferably, the inner tank is a closed container and comprises a cylinder body with an open top and a top cover for sealing the open top of the cylinder body; the cylinder body comprises a cylinder body main body and a compression ring positioned at the top of the cylinder body main body; the compression ring is matched with the section of the cylinder body and is fixedly butted, the thickness of the compression ring is larger than that of the cylinder body, and the compression ring is fixedly connected with the top cover; the track structure is connected and fixed with the outer wall of the anti-pressure ring.

Preferably, the rail structure is formed of a plurality of tie plates, a plurality of partition plates, and a plurality of rail plates; each backing plate is followed the outer wall circumference interval of inner tank sets up, and on each backing plate was fixed in to each baffle correspondence, the both ends of track board were fixed in respectively on two adjacent baffles, borrow by the thickness of baffle makes has the interval between track board and the inner tank outer wall, thereby forms the track structure.

According to the technical scheme, the invention has at least the following advantages and positive effects: in the low-temperature normal-pressure storage tank, the elastic cotton assembly is connected and fixed on the inner tank of the storage tank through the fixing assembly, the upper end of the elastic cotton assembly is clamped through the clamping unit and is hung and fixed on the inner tank through the hook, and the elastic cotton assembly does not need any other fixing points with the barrel in the whole height direction except the hanging fixing points of the hook, so that the outer surface of the elastic cotton assembly is better in streamline form. Receive the tension effect that the ligature area tensioning produced on the cotton subassembly direction of height of elasticity, and make the cotton subassembly of elasticity closely laminate in the surface of inner tank, need not to use the heat preservation nail that low temperature glue bonded to fix as among the prior art, the material and the operating cost of the heat preservation nail that bond that significantly reduce have avoided the heat preservation nail to drop simultaneously and have caused the adverse effect that the cotton subassembly of elasticity can not well laminate the inner tank. In the low-temperature normal-pressure storage tank, the installation of the elastic cotton assembly needs high-altitude construction except for the work of hanging the upper hook, and other work can be completed on the ground, so that more high-altitude construction operations are avoided, the safety of constructors is improved, and the construction cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the low-temperature atmospheric storage tank according to the invention.

Fig. 2 is a schematic diagram of the general structure of the arrangement of the elastic cotton assembly on the inner tank in the th embodiment of the low-temperature normal-pressure storage tank.

Fig. 3 is a schematic structural diagram of the joint of the elastic cotton assembly and the upper part of the inner tank in the th embodiment of the low-temperature normal-pressure storage tank of the invention.

Figure 4 is a rotated view of the inner vessel of figure 3 at section a-a.

FIG. 5 is a partial enlarged view of FIG. 3 at B

FIG. 6 is a schematic view of the connection between the hook and the connection plate in th embodiment of the low-temperature normal-pressure storage tank of the invention.

Fig. 7 is a schematic view of the installation of the bottom fixing member in the bottom heat insulating layer in the th embodiment of the low-temperature and normal-pressure storage tank of the invention.

Fig. 8 is a schematic structural view of a second embodiment of the cryogenic atmospheric storage tank of the present invention.

Fig. 9 is a schematic structural diagram of the connection between the elastic cotton assembly and the upper part of the inner tank in the second embodiment of the low-temperature normal-pressure storage tank of the invention.

The reference numerals are explained below: 1/1a, an outer tank; 121a, a ceiling; 2/2a, inner tank; 21/21a, a cylinder; 211. a cylinder body; 212. a compression resistant ring; 22. a base plate; 23. a top cover; 24. a track structure; 241. a base plate; 242. a partition plate; 243. a track plate; 25a, circumferential reinforcing ribs; 3. an interlayer insulation system; 31. an elastic cotton component; 311. elastic cotton; 312. glass fiber cloth; 313. cotton cloth; 4. a bottom thermal insulation layer; 41. a concrete leveling layer; 5. a base platform; 6. a guardrail; 7. a ladder; 81. an upper fixing member; 811. an outer clamping plate; 812. an inner clamping plate; 813. a fastener; 8131. a stud; 8132. a nut; 814. hooking; 815. a connecting plate; 82. a bottom fixture; 821. a fixed part; 822. a wing portion; 83. a binding tape.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.

The invention provides low-temperature normal-pressure storage tanks, which are mainly used for storing oxygen, nitrogen and argon media in the field of air separation or low-temperature media in engineering projects such as natural gas receiving stations, liquefaction plants, fuel gas peak regulation and the like.

th embodiment referring to fig. 1-7, the low temperature and normal pressure tank of this embodiment is a double arch roof tank.

As shown in fig. 1, the storage tank is mainly composed of main components such as an outer tank 1, an inner tank 2, a sandwich insulation system 3, a bottom insulation layer 4, a foundation cap 5, a guardrail 6, and a ladder 7. Outer jar 1 wholly sits on basic cushion cap 5, for the spherical segment face vault structure, vault upper portion sets up safety protection function's guardrail 6, and 1 outer wall of outer jar sets up ladder 7 from ground to the vault, makes things convenient for operating personnel to pass. The inner tank 2 comprises a cylindrical barrel body 21, a bottom plate 22 positioned at the bottom opening of the barrel body 21 and a top cover 23 covering the top opening of the barrel body 21, the top cover 23 is of a vault structure, the bottom plate 22 is positioned on the upper portion of the bottom heat-insulating layer 4 and supported by the bottom heat-insulating layer 4, and the whole inner tank 2 is completely wrapped by the outer tank 1. An interlayer heat insulation system 3 is arranged in an interlayer space between the inner tank 2 and the outer tank 1, the interlayer heat insulation system 3 comprises pearlife (also called expanded perlite, not shown in the figure) with excellent cold insulation performance and an elastic cotton component 31 (not shown in figure 1, refer to figure 2) with excellent resilience performance, the elastic cotton component 31 covers the outer surface of the side wall of the inner tank 2, and the extrusion force of the pearlife is reduced by the spring action of the elastic cotton and acts on the wall plate of the cylinder 21 of the inner tank 2.

Referring to fig. 2, the elastic cotton member 31 has a plurality of pieces which are sequentially spliced around the circumference of the inner vessel 2 in the entire circumference direction of the inner vessel 2 to completely cover the outer surface of the cylindrical body 21 of the inner vessel 2. In this embodiment, the elastic cotton member 31 is connected and fixed to the inner vessel 2 by a specially designed fixing member. Specifically, the fixing assembly includes an upper fixing 81, a bottom fixing 82, and a banding band 83; the upper fixing piece 81 is used for fixing the upper end of the elastic cotton assembly 31 and is connected and fixed with the inner tank 2 and is also used as a top fixing point of the binding belt 83; the bottom fixing member 82 is fixed to the bottom heat insulating layer 4 as a bottom fixing point of the ligature 83; the ligature 83 is tightened between the upper 81 and lower 82 fasteners to hold the elastic cotton module 31 tightly against the inner vessel 2.

referring to fig. 2 and 3, the cylinder 21 of the inner tank 2 includes a cylinder body 211 and a compression ring 212 located at the top of the cylinder body 211, the compression ring 212 is fixed to the top cover 23 in a sealing manner, the cross section of the compression ring 212 is matched with the cross section of the cylinder body 211 and is fixed in a butt joint manner, the thickness of the compression ring 212 is larger than that of the cylinder body 211, the outer surface of the compression ring 212 forms a track structure 24 through a backing plate 241, a partition plate 242 and a track plate 243 to be matched and connected with the upper fixing member 81, referring to fig. 4, a plurality of backing plates 241 are arranged at intervals along the circumferential direction of the compression ring 212, each backing plate 241 is welded to the outer surface of the compression ring 212 in a fitting manner, the interval between two adjacent backing plates 241 is determined according to the width of the elastic cotton assembly 31, the area of the partition plate 242 is smaller than that of the backing plate 241, the partition plate 242 is correspondingly welded to the backing plate 242, the partition plate 242 is welded to the center 243 of the backing plate 241, the track plate 241, both ends of the track plate 241 are respectively welded to two adjacent partition plates 242, the partition plate 242 has a gap between the two partition plates 242 welded to the same , the partition plate 242 has a fixed gap between the track plate 242, the track plate 242 has a fixed thickness of the track plate 242, the.

Referring to fig. 2, 3, 5 and 6, the upper fixture 81 includes an outer clamping plate 811, an inner clamping plate 812, a fastener 813, a hook 814 and a connecting plate 815. The outer clamping plate 811, the inner clamping plate 812 and the fastener 813 are matched to form a clamping unit for fixedly clamping the upper end of the elastic cotton assembly 31; the hook 814 is fixedly connected to the fastener 813 via a connecting plate 815, and is integrally connected to the clamping unit and the elastic cotton assembly 31, and is then fixedly connected to the rail plate 243 of the inner tank 2.

The outer holding plate 811 and the inner holding plate 812 are made of construction-grade wood (e.g., pine), can resist low temperature, and have excellent properties of small linear expansion coefficient. The length of the outer 811 and inner 812 clamping plates is adapted to the width of the elastic cotton module 31, fitting the edge profile of the upper end of the elastic cotton module 31. The outer clamping plate 811 has a plurality of mounting holes (not numbered) in the form of counterbores formed along the length thereof, and the inner clamping plate 812 has a plurality of mounting holes (not numbered) in the form of through holes formed therein.

The length of the connecting plate 815 is matched with that of the outer clamping plate 811 and the inner clamping plate 812, as shown in fig. 5, hooks 814 are respectively arranged at two ends of the connecting plate 815, the hooks 814 are fixedly attached to the connecting plate 815 in a welding manner, the hook portions of the hooks 814 protrude upwards and depart from the connecting plate 815, the hooks 814 and the connecting plate 815 have lap joint amount to ensure the connection strength through the attachment welding, a plurality of mounting holes (not numbered in the figure) are formed between the two hooks 814 on the connecting plate 815, and the connecting plate 815 and the hooks 814 can be made of low-temperature resistant stainless steel flat steel.

The outer clamping plate 811 is attached to the outer surface of the elastic cotton assembly 31, the inner clamping plate 812 is attached to the inner surface of the elastic cotton assembly 31, and the connecting plate 815 is attached to the inner clamping plate 812. In this embodiment, the fastener 813 includes a stud 8131 and a nut 8132, the stud 8131 sequentially passes through the outer clamping plate 811, the elastic cotton assembly 31, the inner clamping plate 812 and the connecting plate 815, and the nut 8132 is screwed onto the stud 8131 from two ends of the stud 8131 and fixed by spot welding, so that the elastic cotton assembly 31 is clamped between the outer clamping plate 811 and the inner clamping plate 812. The portion of the stud 8131 extending beyond the outer clamping plate 811 is trimmed so that the end of the stud 8131 does not extend beyond the counterbore of the outer clamping plate 811.

As shown in fig. 6, the main structure of the elastic cotton assembly 31 is elastic cotton 311 with thickness, two surfaces of the elastic cotton 311 are covered with cotton cloth 313 and glass fiber cloth 312, wherein the glass fiber cloth 312 also covers the upper end face of the elastic cotton 311 to prevent pearl sand from entering from the top of the elastic cotton 311, the upper ends of the elastic cotton 311, the glass fiber cloth 312 and the cotton cloth 313 are degreased and then bonded by low temperature glue, through holes (not shown) are formed at the bonding positions to match with the fasteners 813, in order to ensure the close contact between the elastic cotton 311 and the glass fiber cloth 312 and the cotton cloth 313, the elastic cotton 311 and the cotton cloth 313 are sewn at two sides of the elastic cotton assembly 31 by stitches (not shown), the stitch positions are spaced, the compression amount of the elastic cotton 311 at each stitch position is not more than 20mm, referring back to fig. 2, when the elastic cotton assembly 31 is spliced, the glass fiber cloth 312 at the outermost side of the elastic cotton assembly 31 partially covers the outer surface of the adjacent elastic cotton assembly 31 to shield the seams between the elastic cotton assemblies 31.

Referring to fig. 2 and 7, the bottom fixing member 82 includes a fixing portion 821 in an inverted U shape and wing portions 822 bent and extended outward from both ends of a U-shaped opening of the fixing portion 821, the wing portions 822 are aligned with each other, and the bottom fixing member 82 may be formed by bending a low temperature resistant stainless steel round steel bar, in this embodiment, the bottom fixing member 82 is embedded in the concrete leveling layer 41 of the bottom insulating layer 4, the concrete leveling layer 41 serves as a surface layer of the bottom insulating layer 4 and contacts with the bottom plate 22 of the inner tank 2 to support the inner tank 2, when the concrete leveling layer 41 is used for concrete pouring, the bottom fixing member 82 is embedded and fixed therein along with the formation of the concrete leveling layer 41, the wing portions 822 of the bottom fixing member 82 are completely embedded in the concrete leveling layer 41 in a horizontal state and protrude from the upper surface of the concrete leveling layer 41, the top fixing member 41 of the fixing portion 821 is disposed on the upper surface of the concrete leveling layer 41 at equal intervals, and the number of the hooks 814 are equal to each other.

Referring to fig. 2, the upper end of the binding band 83 is fastened to the hook 814 of the upper fixing member 81 and ensures the hook 814 to be stably connected, the lower end of the binding band 83 is fixed to the fixing portion 821 of the bottom fixing member 82, and the binding band 83 is tensioned with a proper pulling force to contact the outer surface of the elastic cotton assembly 31 in the whole height direction and make the elastic cotton assembly 31 adhere to the outer surface of the inner vessel 2. The binding band 83 may be a manila rope or a hemp rope.

Preferably, the ligatures 83 are arranged obliquely with an angle α to the horizontal, the angle α may be 60 ° for example, and each ligature 83 contacts at least two adjacent elastic cotton assemblies 31, each elastic cotton assembly 31 is subjected to the tensioning force of at least two adjacent ligatures 83. by the optimum arrangement of the ligatures 83, further ensures the close fit of the elastic cotton assembly 31 to the inner vessel 2.

When the low-temperature normal-pressure storage tank of the embodiment is used for constructing the elastic cotton assembly 31, the whole elastic cotton assembly 31 fixed with the upper fixing piece 81 is sent into an interlayer space between the inner tank and the outer tank from the temporary position of the storage tank by using a hoisting tool, then the hook 814 of the upper fixing piece 81 is hung on the track structure 24 welded on the outer wall of the inner tank 2 in advance, the binding bands 83 are tied on the hook 814, the stable connection of the hook 814 is ensured, the elastic cotton assembly 31 is hung and fixed along the circumferential direction of the inner tank 2 in sequence until all the hanging is finished, finally all the binding bands 83 are tied and fixed on the bottom fixing piece 82 pre-buried in the concrete leveling layer 41 at proper angles, the binding bands 83 are tensioned by adopting proper tension, and the binding bands 83 are ensured to be contacted with the elastic cotton assembly 31 in the whole height direction.

Second embodiment: referring to fig. 8 and 9, the low-temperature normal-pressure storage tank of the present embodiment is a ceiling-type storage tank.

Referring to fig. 8 and 9, the storage tank is composed of main components such as an outer tank 1a, an inner tank 2a, a sandwich insulation system 3, a bottom insulation layer 4, a foundation cap 5, a guardrail 6 and a ladder 7, and the relative positions of the components can be referred to .

The difference from the embodiment is that in this embodiment, the inner tank 2a is of an unsealed structure, the top of the cylinder 21a is open, a circumferential reinforcing rib 25a is arranged on the inner wall of the cylinder 21a near the opening by about 300mm, the outer tank 1a is of a dome structure, a suspended ceiling 121a is suspended below the dome, and the suspended ceiling 121a is near the opening of the top of the cylinder 21a of the inner tank 2 a.

In this embodiment, the outer wall of the inner tank 2a does not need to be additionally provided with a track structure as in of the , the hook 814 of the upper fixing member 81 is directly hung on the top edge of the top opening of the cylinder body 21a, and the specific structures and arrangement modes of the elastic cotton assembly 31, the bandage 83 and the bottom fixing member 82 can all refer to the embodiment, and the description is not repeated here.

According to the embodiments described above, the invention has at least the following advantages: in the low-temperature normal-pressure storage tank, the elastic cotton assembly 31 is connected and fixed on the inner tank 2 through the fixing assembly, the upper end of the elastic cotton assembly 31 is clamped through the clamping unit and is hung and fixed on the inner tank 2 through the hook 814, and the elastic cotton assembly 31 does not need any other fixing point with the cylinder 21 of the inner tank 2 in the whole height direction except the fixing point where the hook 814 is hung, so that the streamline outer surface of the elastic cotton assembly 31 is better, when the elastic cotton assembly 31 is filled with the pearl sand, the streamline outer surface of the elastic cotton assembly 31 can reduce the friction resistance between the pearl sand and the elastic cotton assembly 31, reduce the tensile force born by the elastic cotton structure, improve the safety coefficient of the structure, and the stability of the elastic cotton assembly 31 outside the inner tank 2 is higher. Receive the tension effect that the tensioning of ligature area 83 produced on the elastic cotton subassembly 31 direction of height, and make elastic cotton subassembly 31 closely laminate in the surface of inner tank 2, need not to use the heat preservation nail that low temperature glued bonds to fix as among the prior art, the material and the operating cost of the heat preservation nail that bond that significantly reduces have avoided the heat preservation nail to drop simultaneously and have caused the adverse effect that elastic cotton subassembly 31 can not well laminate inner tank 2. In the low-temperature normal-pressure storage tank, the elastic cotton assembly 31 is installed except that the upper hook 814 is hung and arranged, high-altitude construction is needed, other work can be completed on the ground, more high-altitude construction operations are avoided, the safety of constructors is improved, and the construction cost is reduced.

Since the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.