Double-bottom storage tank capable of preventing tank bottom leakage

Abstract

The invention discloses a double-bottom storage tank capable of preventing tank bottom leakage, the double-bottom storage tank comprises a primary tank bottom, a secondary tank bottom, a tank wall, an annular edge plate and a diversion trench, and concrete is filled between the primary tank bottom and the secondary tank bottom; a plurality of diversion trenches which are distributed circumferentially and extend along the radial direction of the double-bottom storage tank are arranged below the primary tank bottom and on the upper surface of the concrete, a plurality of drain outlets which are in one-to-one correspondence with the diversion trenches are arranged on the tank wall, one end of each diversion trench is positioned in the center of the double-bottom storage tank, and the other end of each diversion trench is communicated with the drain outlets. In the application, aiming at the problem that the leakage condition of the double-layer tank bottom filled with concrete is difficult to find and control, the diversion channels are arranged at the top of the concrete and are uniformly distributed from the center along the radius direction, and the diversion trenches are arranged at the tail ends of the diversion channels, so that the diffusion of leaked stored liquid can be controlled and monitored in real time through the diversion trenches.

Description

Technical Field

[0001] This application belongs to the field of storage tanks, and particularly relates to a double-bottom storage tank for preventing bottom leakage. Background Art

[0002] Vertical oil storage tanks are key equipment in national strategic oil reserve bases. They are usually composed of a tank wall, a floating roof, a tank bottom plate, and other auxiliary equipment, and their designed service life is very long, generally 30 - 50 years. During long-term use, due to the particularity of the storage medium in the storage tank, changes in environmental factors, and improper anti-corrosion treatment during construction, etc., different degrees of corrosion phenomena generally exist on the upper and lower surfaces of the tank bottom plate.

[0003] As people's awareness of environmental protection is getting stronger and stronger, and the government's requirements for environmental protection, storage, and control of inflammable and explosive products are getting stricter and stricter, a new type of double-bottom vertical cylindrical storage tank has begun to be applied. Currently, EU countries such as Poland have legally and regulatively required that newly built storage tanks whose storage media may pollute the environment must adopt a double-bottom structure, and in-service storage tanks must be gradually retrofitted with double bottoms.

[0004] The existing double-layer steel tank bottom is composed of a primary steel tank bottom plate, a filler, and a secondary steel tank bottom plate, and is filled with compacted gravel or concrete. The upper bottom plate is subjected to the action of the medium and the tank body load, has a continuous plane support, and the deformation and stress conditions are better than those of a discontinuous support structure. Therefore, this structure can be used for the new construction or renovation of the bottom of large vertical oil storage tanks.

[0005] However, this double-bottom structure of the tank has the following disadvantages:

[0006] When the sealing effect is not good or the seal fails, it may lead to increased corrosion on the side of the tank bottom, and it is required to block or weld and seal between the lower surface of the primary tank bottom plate and the lower tank bottom plate. This clause requires a closed double-bottom structure. Considering the limited welding space here, it is difficult to guarantee the welding quality, and there are likely to be cracks or other defects when using fillet welds. In addition, once leakage occurs at the primary tank bottom, since the flow of the leaked oil in the filler is difficult to control, the leakage situation may not be detected in time. Summary of the Invention

[0007] In order to solve the problems raised in the background art, this application provides a double-bottom storage tank for preventing bottom leakage. To achieve the above object, this application provides the following technical solutions:

[0008] A double-bottom storage tank for preventing bottom leakage, the double-bottom storage tank comprising: a primary bottom, a secondary bottom, a tank wall, a circular edge plate, and a diversion groove, the primary bottom being located above the secondary bottom; the bottom of the primary bottom being in contact with and welded to the circular edge plate; and the outer edge of the circular edge plate being in contact with and welded to the tank wall; the bottom of the tank wall being in contact with and welded to the secondary bottom, and concrete being filled between the primary bottom and the secondary bottom;

[0009] Below the primary bottom, on the upper surface of the concrete, there are a plurality of diversion grooves distributed circumferentially and extending radially along the double-bottom storage tank, and a plurality of sewage outlets corresponding to the diversion grooves one by one are provided on the tank wall. One end of the diversion groove is located at the center of the double-bottom storage tank, and the other end of the diversion groove is communicated with the sewage outlet.

[0010] Further, a wire mesh is provided in the concrete.

[0011] Further, an anti-seepage membrane is provided between the concrete and the secondary bottom.

[0012] Further, the anti-seepage membrane is circular and covers the entire bottom of the concrete, and the edge of the anti-seepage membrane is directly or indirectly fixed on the tank wall.

[0013] Further, a support steel ring is provided between the circular edge plate and the secondary bottom, and the support steel ring is circular and fits with the tank wall.

[0014] Further, the support steel ring is welded to the secondary bottom, the circular edge plate, and the tank wall.

[0015] Further, a plurality of U-shaped plates corresponding to the diversion grooves one by one are also provided in the double-bottom storage tank. Both ends of the U-shaped plate are in contact with and welded to the tank wall, thereby forming a diversion collection area, and the diversion groove penetrates through the U-shaped plate.

[0016] Technical effects and advantages of the present application:

[0017] In the present application, aiming at the problem that it is difficult to detect and control the leakage of the double-layer bottom filled with concrete, a diversion channel is provided on the top of the concrete, which is evenly distributed along the radius direction from the center, and a diversion groove is provided at the end of each diversion channel, so that the diffusion of the leaked liquid can be controlled and monitored in real time through the diversion groove.

[0018] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures pointed out in the specification and the drawings. Description of the Drawings

[0019] Figure 1 Structural schematic diagram of a double-bottom storage tank for preventing bottom leakage in this application;

[0020] Figure 2 Top view of a double-bottom storage tank for preventing bottom leakage in this application;

[0021] Figure 3 Structural schematic diagram of the U-shaped plate in a double-bottom storage tank for preventing bottom leakage in this application.

[0022] In the figure: 1 - primary bottom, 2 - secondary bottom, 3 - tank wall, 4 - support steel ring, 5 - pressing plate, 6 - annular edge plate, 7 - wire mesh, 8 - anti-seepage membrane, 9 - U-shaped plate, 10 - diversion groove, 11 - conduit, 12 - valve. Specific embodiments

[0023] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0024] In addition, in the invention, terms such as "first", "second" and other similar terms do not intend to imply any order, quantity and importance, but are only used to distinguish different elements. Terms such as "upper", "lower", "left", "right" and other similar terms are only the positional relationships in the drawings.

[0025] As Figure 1 shown, the embodiments of this application disclose a double-bottom storage tank for preventing bottom leakage. The double-bottom storage tank includes: a primary bottom 1, a secondary bottom 2, a tank wall 3 and an annular edge plate 6. The primary bottom 1 is located above the secondary bottom 2; the bottom of the primary bottom 1 is in contact with and welded to the annular edge plate 6; and the outer edge of the annular edge plate 6 is in contact with and welded to the tank wall 3; the bottom of the tank wall 3 is in contact with and welded to the secondary bottom 2, and concrete is filled between the primary bottom 1 and the secondary bottom 2.

[0026] In one embodiment of this application, a wire mesh 7 is provided in the concrete to reinforce the structural strength of the concrete.

[0027] In one embodiment of this application, an anti-seepage membrane 8 is provided between the concrete and the secondary bottom 2. The anti-seepage membrane 8 is circular and concentric with the double-bottom storage tank. The edge of the anti-seepage membrane 8 is located between the concrete and the support steel ring 4. The anti-seepage membrane 8 covers the entire bottom of the concrete, and the edge of the anti-seepage membrane 8 is fixed to the support steel ring 4 through a pressing plate 5 and bolts.

[0028] As Figure 1 shown, in an embodiment of the present application, a support steel ring 4 is provided between the annular edge plate 6 and the secondary tank bottom 2. The support steel ring 4 is annular and fits with the tank wall 3, and the support steel ring 4 is welded to the secondary tank bottom 2, the annular edge plate 6, and the tank wall 3.

[0029] As Figure 2 and Figure 3 shown, in an embodiment of the present application, below the primary tank bottom 1, a plurality of diversion channels 10 extending radially along the double-bottom storage tank are provided on the upper surface of the concrete in a circumferential distribution. A plurality of sewage outlets corresponding to the diversion channels 10 one by one are provided on the tank wall 3. One end of the diversion channel 10 is located at the center of the double-bottom storage tank, and the other end of the diversion channel 10 is communicated with the sewage outlet.

[0030] Aiming at the problem that it is difficult to detect and control the leakage of the double-layer tank bottom filled with concrete, a diversion channel is provided at the top of the concrete, which is evenly distributed along the radius direction from the center, and a diversion groove and a monitoring device are provided at the end of each diversion channel. The control and real-time monitoring of the diffusion of the leaked liquid storage are realized.

[0031] As Figure 2 shown, in an embodiment of the present application, a plurality of U-shaped plates 9 corresponding to the sewage outlets one by one are further provided in the double-bottom storage tank. Both ends of the U-shaped plate 9 are in contact with and welded to the support steel ring 4, thereby forming a diversion collection area, and the diversion channel 10 penetrates through the U-shaped plate 9. As Figure 3 shown, in an embodiment of the present application, a conduit 11 is installed at each sewage outlet, and a valve 12 is installed on the conduit 11.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-bottom storage tank for preventing bottom leakage, characterized in that, The double-bottom storage tank includes: a primary tank bottom (1), a secondary tank bottom (2), a tank wall (3), an annular edge plate (6), and a diversion channel (10). The primary tank bottom (1) is located above the secondary tank bottom (2); the bottom of the primary tank bottom (1) is in contact with and welded to the annular edge plate (6); the outer edge of the annular edge plate (6) is in contact with and welded to the tank wall (3); the bottom of the tank wall (3) is in contact with and welded to the secondary tank bottom (2), and concrete is filled between the primary tank bottom (1) and the secondary tank bottom (2). Below the primary tank bottom (1), a plurality of diversion channels (10) extending radially along the double-bottom storage tank are provided on the upper surface of the concrete in a circumferential distribution. A plurality of sewage outlets corresponding to the diversion channels (10) one by one are provided on the tank wall (3). One end of the diversion channel (10) is located at the center of the double-bottom storage tank, and the other end of the diversion channel (10) communicates with the sewage outlet.

2. The double-bottom storage tank for preventing bottom leakage according to claim 1, characterized in that, A wire mesh (7) is provided in the concrete.

3. The double-bottom storage tank for preventing bottom leakage according to claim 1, characterized in that, An anti-seepage membrane (8) is provided between the concrete and the secondary tank bottom (2).

4. The double-bottom storage tank for preventing bottom leakage according to claim 3, wherein, The anti-seepage membrane (8) is circular and covers the entire bottom of the concrete, and the edge of the anti-seepage membrane (8) is directly or indirectly fixed on the tank wall (3).

5. A double-bottom storage tank for preventing bottom leakage according to claim 1, characterized in that, A support steel ring (4) is provided between the annular edge plate (6) and the secondary tank bottom (2). The support steel ring (4) is annular and fits with the tank wall (3).

6. A double-bottom storage tank for preventing bottom leakage according to claim 5, characterized in that, The support steel ring (4) is welded to the secondary tank bottom (2), the annular edge plate (6), and the tank wall (3).

7. The double-bottom storage tank for preventing bottom leakage according to claim 1, characterized in that, A plurality of U-shaped plates (9) corresponding to the diversion channels (10) one by one are further provided in the double-bottom storage tank. Both ends of the U-shaped plate (9) are in contact with and welded to the tank wall (3), thereby forming a diversion collection area, and the diversion channel (10) penetrates through the U-shaped plate (9).

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