JPS61103094A - Double shell low temperature tank made of concrete - Google Patents

Abstract

PURPOSE:To obtain a storage tank, whose horizontal and vertical distortion need not be restricted, by suspending various piping installations for acceptance and delivery of liquid from the top of the dome of an inside tank in a state where the horizontal and vertical distortion of the pipings is allowed. CONSTITUTION:In the center of the dome 11 of an inside tank 1 made of concrete an opening 12 is set up in order to suspend various piping installations A and staircase installations B for inspection within the inside tank 1. An inside hatch 3 blocks the inside tank 1 to maintain the airtightness, and also allows the horizontal distortion to be generated between the sliding face 34 of the inside hatch 3 and the supporting face 14 of the inside tank 1. The opening 22 of an outside tank 2 is blocked by the use of a blocking plate 24 formed of a circular stainless steel sheet in the same manner as in the case of the inside hatch 3. That is, a through hole is set up in a position on the blocking plate 24 where a piping A protrudes, and the circumference of the piping A is covered with a heat insulating material 6, so that he blocking is performed in a state where the distortion of the piping A is not restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a concrete double-shell cryogenic storage tank for storing ultra-low temperature liquefied gas such as LNG.

[B] Conventional Technology Among low-temperature tanks for storing ultra-low temperature liquids such as LNG, there is a double-shell storage tank in which an inner tank and an outer tank are made of concrete or the like with excellent strength.

Various research and developments have been conducted on this double tank in order to cope with horizontal or vertical deformation caused by hydraulic pressure, temperature contraction, earthquakes, etc.

[Explanation] Problems to be Solved by the Invention There are various advantages by constructing the tank from concrete.

On the other hand, there are cases where various piping and staircase equipment for lateral access inside the inner tank are installed in a concrete tank.

At this time, if these steel equipment are fixed directly to the tank, there is a risk that the piping equipment and the tank will be damaged due to the difference in temperature shrinkage between the steel and concrete.

Therefore, there is a need to develop a technology that does not restrict horizontal and vertical deformation between the tank and the piping when installing various types of piping, staircase equipment, etc. in the tank.

The present invention has been made in view of the above points, and is
3. It is an object of the present invention to provide a concrete double-shell cryogenic storage tank which can be equipped with various piping and stair facilities to "restrict" vertical deformation, and which also has good heat insulation properties.

[C] Means for solving the problem The present invention provides a solution by suspending various piping equipment for receiving and discharging liquid from the top of the dome of the inner tank while allowing deformation in the horizontal and vertical directions. This invention relates to technical means that can cope with horizontal forces and vertical deformation, and also maintain airtightness inside the tank.

L21 Embodiment An embodiment of the structure of the concrete double-shell cryogenic storage tank according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the concrete double-shell low temperature storage tank according to the present invention is composed of two independently formed sealed bodies, an inner tank 1c15 and an outer tank 2.

(1) Inner tank (Figure 1.2) Inner tank 1 was formed by integrally forming a concrete bottom, side wall J3, and roof, and pasting a low-temperature brittle membrane, etc. over the entire inner wall. It is a storage tank.

(2) Structure of the opening of the inner tank (Fig. 2.3) In the center of the dome 11 of this inner tank 1, various piping installations 11i11A and lifting stairs equipment B for inspection are attached to the inner tank 1. An opening 12 is opened.

A cylindrical flange 13 is provided on the periphery of the opening 12 so as to stand upward.

A horizontal annular support surface 14 is formed on the top surface of the 7 flange 13.

These seven lunges 13 can be easily formed together with the molding of the inner tank body when constructing the inner tank 1 by pouring concrete.

(3) Inner lid (Fig. 2.3) Inner lid M3 is a closing plate 3 made of, for example, a stainless steel plate and shaped so that it can be placed on the top surface of the flange 13 to close the opening 12.
1, and a reinforcing cylinder 32 which is integrally connected to the upper surface of the closing plate 31 and reinforces the inner lid 3.

The reinforcing cylinder 32 is formed to have an outer diameter smaller than the inner diameter of the flange 13.

Furthermore, as shown in the figure, key-shaped teeth are carved in the upper outer periphery of the reinforcing cylinder 32 in the vertical direction at equal pitches to form a group of vertical keys 33.

(4> Vertical key The vertical key 33 formed in an uneven shape is attached to the flange 13 on the inner cover 3.
When closing the vertical key 33, the slide surface 34, which is the lowermost surface of the vertical key 33, is formed in a size that allows it to come into contact with and lock the support surface 14.

The vertical cross-sectional shape of the vertical key 33 in the horizontal direction is formed into a rectangular, triangular, or circular shape.

Further, a known material having a small coefficient of friction may be pasted on the slide surface 34 or the support surface 14 in order to allow both to slide smoothly.

(5) For hanging piping etc. to the inner lid, in the center of the closing plate 31, the piping A that receives and discharges the liquefied gas stored in the inner tank 1 is passed through and fixed integrally to the inner lid 3. Let it droop.

Since the hanging pipe A etc. and the blocking plate 31 are made of metal,
It is easy to weld and tighten bolts, and since the thermal envelope coefficient is the same, it is advantageous against temperature deformation.

(6) Installing the inner lid The reinforcing tube 32 is inserted into the opening 12 with the reinforcing tube 32 facing downward.

The sliding surface 34 on the bottom of the vertical key 33 is inside M! It is placed on the support surface 14 of i1 and the opening 12 is closed.

The inner M3 is not fixed integrally to the flange 13,
For example, an elongated hole 35 is formed in the inner cover 3, and the inner cover 3 is attached with a bolt through the elongated hole 35 while allowing horizontal sliding.

As a result, the inner lid 3 closes the inner tank 1 to maintain airtightness, and the sliding surface 34 of the inner lid 3 and the support surface 1 of the inner tank 1
4, the deformation in the water IL direction that occurs can be tolerated.

As described above, the inner M3 closes the L1 portion 12 to form a completely sealed body that is horizontally slidable.

(7) Outer tank (Fig. 1.3) The outer tank 2 is a protective shell made of concrete for the purpose of housing the inner tank 1 having the above-mentioned structure and protecting the inner tank 1 therein.

An opening 22 is provided in the center of the dome 21 of the outer tank 2 to expose the piping A and the like to the outside.

On the inner circumferential surface of the opening 22, a vertical boss 23 consisting of a concave curved surface extending in the vertical direction is formed at a position corresponding to the vertical key 33.

The shape of each unevenness of the vertical boss 23 is formed to approximately approximate the shape of the vertical key 33, as shown in FIG.

That is, when the vertical key 33 approaches the vertical boss 23 and engages with it, the vertical key 33 is formed into a shape that can be gradually restrained.

Therefore, even if the inner tank 1 is cooled and temperature deformation occurs in the horizontal and vertical directions between the inner lid 3 and the outer tank 2, the vertical keys 33 and the vertical bosses 23 will be deformed in the horizontal and vertical directions. There is no restriction on

Or, for horizontal displacement such as during an earthquake,
This problem can be sufficiently resolved by engaging the vertical key 33 and the vertical boss 23.

Particularly, when the displacement of the inner lid 3 is large, the vertical 1=-33 gradually engages while destroying the vertical boss 23, and this displacement can be easily controlled.

Similarly to the inner lid 3, the opening 22 of the outer tank 2 is closed using a closing plate 24 made of, for example, circular stainless steel.

That is, a through hole is opened in the plate surface of the closing plate 24 at the position where the piping A protrudes, and the area around the piping is covered with a heat insulating moon 6, and the piping A is closed without restraining its deformation, resulting in a complete seal. Forms the external cisterna 2 of the body.

(8> Treatment of the space between the inner tank and the outer tank The entire area of the space generated between the outer periphery of the inner tank 1 and the inner periphery of the outer tank 2 is filled with IS thermal material 6 such as pearlite. Figure) [E] EffectsNext, we will explain the items required for a general double-shell low-temperature storage tank as a buffer function against aH, and then we will discuss the effects of the concrete two-small-shell storage tank of the present invention (1). Conditions for a double-shell cryogenic storage tank Regarding a general double-shell cryogenic storage tank, the following items are required in terms of buffer function and ramie.

<A> Ability to absorb deformation due to temperature shrinkage difference between the inner tank and piping, etc. <3> Ability to control deformation of the inner tank, piping, etc. during an earthquake.

<C> Being able to control the deformation of the inner and outer tanks during an earthquake.

<[)> Capable of absorbing deformation due to temperature contraction of the outer tank and piping, etc.

<E> Being able to control the deformation of the outer tank and piping during an earthquake.

<F> Maintains good cold insulation effect and airtightness.

The above items are combined with the concrete two-citrus husk low-temperature storage +
Let's examine 111 specifically.

Regarding item 1 A>] In the tank of the present invention, the piping A etc. are fixed to the inner lid 3 made of the same material.

Furthermore, the inner M3 and the inner tank 1 are configured to allow horizontal sliding between them.

Therefore, since the C1 pipe A, etc. and the inner lid M3 undergo deformation due to temperature contraction in the same state, the pipe A and the inner cover 3 do not separate.

Since the space between the support surface 14 of the inner tank 1 and the slide surface 34 of the inner lid 3 is configured to be slidable, horizontal deformation is not restricted.

Therefore, expansion and contraction of the inner M3 will not affect the inner tank 1.

[About the construction page of <B>] Slide surface 34 of vertical key 33 of inner cover 3 that hangs pipe A
Since the space between the support surface 14 of the inner tank 1 and the vertical key 33 and the vertical boss 23 of the outer tank 2 can be slid freely, it is possible to freely slide between the vertical key 33 and the vertical boss 23 of the outer tank 2. Both directional and vertical behavior are absorbed.

[Regarding item <C> J Inner tank 1 and outer WI2 are not integral structures but molecules JI L-(
Configured.

Therefore, deformation caused by earthquakes or temperature contraction is not transmitted to each other.

Regarding item 1D> Even if the inner cover 3 that hangs the pipe A etc. is deformed due to temperature contraction, the sliding movement of the vertical key 33 is not restricted by the presence of the vertical boss 23.

Rather, the vertical boss 23 plays the role of a kite when the vertical key 33 slides, while allowing for deformation due to temperature contraction.

Regarding item -E>] Horizontal deformation of the pipe A etc. during an earthquake is absorbed by the engagement of the vertical boss 23 and the vertical key 33.

That is, as shown in FIG.
If deformation cannot be tolerated between the air spaces S in contact with the three side walls, the deformation can be gradually controlled while destroying the side walls of the vertical boss 23.

[Regarding item <F>, since the insulation material 6 was not interposed between the entire circumferential surfaces of the inner tank 1 a3 and the outer tank 2, a good cold insulation effect can be maintained.

[Brief explanation of the drawing]

Figure 1.2 Concrete city according to the present invention;,) storage p7
An explanatory diagram of one embodiment. Fig. 2: An explanatory diagram of the closed state of the inner tank. Fig. 3: An explanatory diagram showing the closed state of the openings of the inner tank and the outer tank. Cross-sectional view 1: Inside
1 2: Outside tank 3: Inside j? f applicant
Taisei Construction Co., Ltd. Figure 2 Figure 3

Claims (1)

[Scope of Claims] A sealed inner tank is formed by placing a closing plate in an opening made in a dome of an inner tank made of concrete, and the inner tank is placed in an outer tank made of a sealed concrete body. Both tanks are housed separately and independently, with a heat insulating material interposed between the entire circumferential surface of both tanks, and piping for receiving and discharging liquid and lifting stairs equipment for inspecting the inside of the tank are hung from the blocking plate to prevent blockage. A double-shell concrete low-temperature storage tank characterized by a configuration in which vertical and horizontal deformation is mutually allowed between the plate, inner tank, and outer tank.