Novel steel structure for reducing low-temperature impact influence of low-temperature storage tank

Abstract

The utility model discloses a novel steel structure for reducing low-temperature impact influence of a low-temperature storage tank, which is integrally in an axisymmetric shape and sequentially comprises an upper folding angle steel ring, a secondary steel wall, a lower folding angle steel ring, a thermal expansion bent ring and a secondary steel bottom from an outer tank wall to the center of the storage tank, temperature difference strain (low-temperature impact) generated on the rigid joint of the concrete tank wall and the bottom plate due to the fact that (ultra) low-temperature liquid leaks from the inner tank is reduced together with a cold insulation and heat insulation material capable of bearing high loads, and meanwhile a foundation of the low-temperature tank is protected. Due to the fact that the flexibility of the novel steel structure is greatly improved compared with a traditional structure, the stress and the strain of the novel steel structure are small under the normal working condition and the abnormal condition, especially the strain is greatly reduced, and the safety of the low-temperature tank is improved. And meanwhile, the steel parts can be prefabricated in a factory, so that site construction is more convenient, the length of a site welding joint is reduced, and the installation cost and time are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of low temperature storage tank design construction, concretely relates to a novel steel structure for reducing low temperature impact influence of low temperature storage tank. BACKGROUND

[0002] The existing large low temperature constant (micro) pressure liquefied gas storage tank (referred to as low temperature storage tank) generally includes an outer tank and an inner tank arranged in the outer tank. The secondary tank wall and the secondary tank bottom part of the low temperature impact influence reduction system are generally arranged between the inner tank wall and the outer tank wall and between the inner tank bottom and the outer tank bottom, so that the leaked (ultra) low temperature liquid can be accommodated in the event of abnormal conditions such as inner tank leakage, direct contact of the ultra low temperature liquid with the concrete wall and the concrete bottom of the concrete outer tank or direct contact of the ultra low temperature liquid with the storage tank foundation of the steel outer tank is avoided, excessive deformation and strain are caused, and the function of the outer tank to contain the (ultra) low temperature liquid leaked from the inner tank is lost.

[0003] At present, the existing low temperature tank low temperature impact influence reduction system has two structures: 1) only low temperature steel plate is used through on-site cutting and welding; and 2) a thin film low temperature liquid sealing system of special aluminum foil glass fiber composite material is bonded through low temperature glue. The steel structure of structure 1) has no flexibility, and it is difficult to completely realize the transmission of the load to the outer tank through the load-bearing cold insulation material, and the on-site welding work is large, the construction difficulty is great, the construction period is long, the construction cost is high, and the safety is low, and structure 1) is gradually eliminated. In addition, the thin film low temperature liquid sealing system of the aluminum foil glass fiber composite material bonded by the low temperature glue of structure 2) has low strength and large thermal expansion coefficient, and is prone to leakage. Moreover, the thin film low temperature liquid sealing system of the composite material has very high requirements on the construction conditions, and the skill requirements of the construction workers are also very high. The materials approved by the construction personnel of the special technology provider must be used, so that the cost is extremely high, the construction period is long, the safety is low, and the thin film low temperature liquid sealing system of the composite material is rarely used on the fully contained storage tank.

[0004] At present, there is no related patent about the low temperature storage tank low temperature impact influence reduction system and the steel structure thereof. CONTENT OF THE UTILITY MODEL

[0005] In view of the problems existing in the prior art, the utility model provides a novel steel structure for reducing low temperature impact influence of a low temperature storage tank, which increases the flexibility of the steel structure, can greatly reduce the plastic strain deformation of the existing structure, and has axial symmetry, uniform stress, small strain, high structural safety due to the length of the weld being reduced, and low construction and installation cost and construction period, so that the total cost of the low temperature tank is reduced.

[0006] The technical scheme adopted by the utility model is as follows:

[0007] The utility model provides a new type steel structure for low temperature storage tank reduces low temperature impact influence, including upper flanged angle ring, upper flanged angle ring is fixedly connected with secondary steel wall, lower flanged angle ring and secondary steel bottom through lap joint welding mode in proper order, wherein the connecting place of lower flanged angle ring and secondary steel bottom is welded with thermal expansion bend ring through butt joint.

[0008] As a preferred embodiment of the utility model, the connecting place of the upper flanged angle ring and / or the lower flanged angle ring and the secondary steel wall is welded with a thermal expansion bend ring through a butt joint.

[0009] As a preferred embodiment of the utility model, the radius of curvature of the upper flanged angle ring and / or the lower flanged angle ring is consistent with the low temperature storage tank.

[0010] As a preferred embodiment of the utility model, the thermal expansion bend ring is a flexible structure with a radius of curvature consistent with the low temperature storage tank.

[0011] As a preferred embodiment of the utility model, the side length of the upper flanged angle ring and / or the lower flanged angle ring is 50mm-400mm, and the thickness is 5mm-20mm.

[0012] As a preferred embodiment of the utility model, the upper flanged angle ring and / or the lower flanged angle ring is composed of a plurality of flanged angle members, wherein the length of each flanged angle member is 1.5m-12m.

[0013] As a preferred embodiment of the utility model, the size of the cross section of the thermal expansion bend ring is 30mm*30mm-500mm*500mm, and the thickness is 5mm-20mm.

[0014] As a preferred embodiment of the utility model, the thermal expansion bend ring is composed of a plurality of thermal expansion bend ring members, wherein the length of each thermal expansion bend ring member is 1.5m-12m.

[0015] As a preferred embodiment of the utility model, the secondary steel bottom is composed of a middle plate and an edge plate, wherein two adjacent middle plates are fixedly connected through a lap joint welding mode, and the middle plate and the edge plate are fixedly connected through a lap joint welding mode.

[0016] As a preferred embodiment of the utility model, the edge plate is a sector, and two adjacent edge plates are fixedly connected through a butt joint welding mode.

[0017] The utility model has the advantages of:

[0018] The new type steel structure for low temperature storage tank reduces low temperature impact influence system provided by the utility model optimizes a complete axisymmetric structure from a polygonal structure in the past, and the flexibility of the steel structure is increased.

[0019] The new steel structure has great flexibility than the traditional structure, and the stress and strain of the new steel structure under normal working condition and abnormal condition are smaller, especially the strain is greatly reduced, which increases the safety of the low-temperature tank; the steel parts are prefabricated in the factory, which is more convenient for on-site construction, reduces the length of the welding joints on site, reduces the installation cost and time, and thus reduces the comprehensive cost of the whole low-temperature tank.

[0020] The new steel structure has great flexibility than the traditional structure, and the stress and strain of the new steel structure under normal working condition and abnormal condition are smaller, especially the strain is greatly reduced, which increases the safety of the low-temperature tank; the steel parts are prefabricated in the factory, which is more convenient for on-site construction, reduces the length of the welding joints on site, reduces the installation cost and time, and thus reduces the comprehensive cost of the whole low-temperature tank. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic view of the whole structure of the low-temperature tank.

[0022] Figure 2 It is a schematic view of the whole structure of the low-temperature tank.

[0023] Figure 3 It is a cross-sectional view of the upper folded edge angle ring.

[0024] Figure 4 It is a cross-sectional view of the lower folded edge angle ring.

[0025] Figure 5 It is a cross-sectional view of the thermal expansion bending ring.

[0026] In the drawing: A is the inner tank, B is the outer tank, C is the suspended ceiling, D is the new steel structure for reducing the impact of low-temperature impact, 1 is the upper folded edge angle ring, 2 is the secondary steel wall, 3 is the lower folded edge angle ring, 4 is the thermal expansion bending ring, and 5 is the secondary steel bottom. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] As shown in Figure 1 and Figure 2 A new steel structure for reducing the impact of low-temperature impact of a low-temperature tank, comprising an upper folded edge angle ring 1, the upper folded edge angle ring 1 is sequentially connected with a secondary steel wall 2, a lower folded edge angle ring 3 and a secondary steel bottom 5 through a lap joint welding mode, wherein the connection between the lower folded edge angle ring 3 and the secondary steel bottom 5 and the upper folded edge angle ring 1 and the secondary steel wall 2 is welded with a thermal expansion bending ring 4 through a butt joint.

[0029] The curvature radius of the upper folded angle steel ring 1, the lower folded angle steel ring 3 and the thermal expansion bending ring 4 is consistent with the low-temperature storage tank, wherein the shape of the thermal expansion bending ring 4 is not limited to the shape in the figure, but can also be a flexible structure such as a "O" shape, a "Π" shape, a "Ω" shape, a "U" shape, an "M" shape, an "N" shape, a "Z" shape and a semicircle shape.

[0030] The secondary steel bottom 5 is composed of a middle plate and an edge plate, wherein the edge plate is a fan-shaped plate, two adjacent middle plates are fixedly connected by a lap joint welding method, the middle plate and the edge plate are fixedly connected by a lap joint welding method, and two adjacent edge plates are fixedly connected by a butt joint welding method, and the thickness of the secondary bottom plate and the secondary wall plate is between 5mm and 10mm.

[0031] As shown in Figure 3 and Figure 4 , the upper folded angle steel ring 1 and the lower folded angle steel ring 3 are folded from low-temperature steel plates to form angle steels, and are bent to have a curvature radius corresponding to the low-temperature tank according to the positions thereof. The forming process can be cold working or hot working. According to the size of the radius of the storage tank, the upper folded angle steel ring 1 and the lower folded angle steel ring 3 can be divided into several parts and preformed in a prefabrication factory, and then welded together by butt joints at the site. The upper folded angle steel ring 1 and the lower folded angle steel ring 3 are welded to the low-temperature steel plates pre-embedded inside the reinforced concrete outer tank by butt joints.

[0032] The upper folded angle steel ring 1 and the lower folded angle steel ring 3 can be equilateral or not equilateral. According to the size of the diameter of the storage tank and the stored product, the side length can be between 50mm and 400mm, and the thickness can be between 5mm and 20mm. According to the diameter of the storage tank, the upper folded angle steel ring can be divided into multiple components. Based on the processing capacity of the prefabrication factory, the length of each upper folded angle steel ring component is between 1.5m and 12m. In order to increase safety, the longer the length of each upper folded angle steel ring component is, the better, preferably between 5m and 12m. Therefore, the number of upper folded angle steel ring components is generally between 4 and 210.

[0033] As shown in Figure 5 ​As shown, the thermal expansion bending ring 4 is a flexible structure that processes the low-temperature steel plate at the location into the corresponding curvature radius of the low-temperature tank, and the forming process can be cold working or hot working, and can be formed by molding, or can be formed by welding through butt joints. According to the radius size of the storage tank, the thermal expansion bending ring 4 can be divided into several parts and prefabricated in the prefabrication factory, and welded into a ring through butt joints on site, and welded together with the lower flange angle steel ring 3 through butt joints. The cross-sectional size of the thermal expansion bending ring 4 is between 30mm*30mm and 500mm*500mm, and the thickness of the steel plate is between 5mm and 20mm. Based on the different processing capacity of the prefabrication factory, the length of each thermal expansion bending ring is between 1.5 meters and 12 meters. In order to increase safety, the longer the length of each thermal expansion bending ring member is, the better, preferably between 5 meters and 12 meters. Therefore, the number of thermal expansion bending ring members is generally between 4 and 210.

[0034] In order to facilitate construction, a convenient welding backing plate is added in the use of the above-mentioned butt joint.

[0035] In some more specific embodiments:

[0036] In a certain low-temperature storage tank project, the outer tank of the low-temperature tank has a diameter of 52m, the inner tank has a diameter of 50m, and the curvature radius is 98m; the upper flange angle steel and the lower flange angle steel members arranged between the inner tank and the outer tank have a side length of 170mm, a thickness of 10mm, and a length of about 6m, and are prefabricated by cold bending process; the thermal expansion bending ring member is shaped, has a thickness of 5mm, and has a length of about 6m; the upper flange angle steel member and the lower flange angle steel member and the thermal expansion bending ring member each have 28 pieces; the secondary steel bottom connected with the thermal expansion bending ring is composed of a middle plate and 16 edge plates, and the thickness of the middle plate and the edge plate is 5mm.

[0037] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and do not limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A new steel structure for reducing the effect of low temperature impact on cryogenic storage tanks, characterized by, The novel steel structure comprises an upper folding angle steel ring (1), which is fixedly connected to a secondary steel wall (2), a lower folding angle steel ring (3) and a secondary steel bottom (5) in sequence by means of lap joint welding, wherein a thermal expansion bend ring (4) is welded at the connection between the lower folding angle steel ring (3) and the secondary steel bottom (5) via a butt joint.

2. The novel steel structure according to claim 1, characterized in that, The connection between the upper folded angle steel ring (1) and / or the lower folded angle steel ring (3) and the secondary steel wall (2) is welded with a thermal expansion bent ring (4) via a butt joint.

3. The novel steel structure according to claim 2, characterized in that, The side length of the upper folding angle steel ring (1) and / or the lower folding angle steel ring (3) is 50 mm to 400 mm, and the thickness is 5 mm to 20 mm.

4. The novel steel structure according to claim 3, characterized in that, The upper folding angle steel ring (1) and / or the lower folding angle steel ring (3) are composed of a plurality of folding angle steel components.

5. The novel steel structure according to claim 4, characterized in that, The length of the folded angle steel component is 1.5m to 12m.

6. The new steel structure according to claim 2, characterized in that, The cross-section of the thermal expansion bending ring (4) has a size of 30mm×30mm to 500mm×500mm, and a thickness of 5mm to 20mm.

7. The novel steel structure according to claim 6, characterized in that, The thermal expansion bend ring (4) is composed of a plurality of thermal expansion bend ring components.

8. The novel steel structure according to claim 7, characterized in that, The length of the thermal expansion bending ring component is 1.5m to 12m.

9. The novel steel structure according to claim 1, characterized in that: The secondary steel bottom (5) is composed of a middle plate and edge plates, wherein two adjacent middle plates are fixedly connected by lap joint welding, and the middle plate and the edge plates are fixedly connected by lap joint welding.

10. The novel steel structure according to claim 9, characterized in that, The edge plates are fan-shaped, and two adjacent edge plates are fixedly connected by butt joint welding.

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