JPH06337100A - Supporting structure for liquefied gas transport tank - Google Patents

Abstract

PURPOSE:To allow for the thermal deformation of a tank itself before and after filling liquefied gas by closely supporting the tank within a ship's hull on the upper surface of a base section laid on a ship's inner bottom via a slide member fitted to the lower surface of the tank, and causing the slide member and the base section to give slide motion. CONSTITUTION:A plurality of base sections 8 are arranged on a ship's inner bottom, and a slide member 7 projected from the lower surface of a tank via a slide member mounting means 12 is laid on the upper surface of the sections 8 in close contact state. The means 12 is fastened to the lower surface of the tank and formed out of an angled mounting frame 13 allowing the insertion of the member 7 from a lower side, and a crank-shaped strip mounting member 14 having one end led through the insertion hole 20 drilled through the side of the member 7 horizontally and other end jointed to the lower surface of the frame 13. According to this constitution, the slide member 7 becomes slidable on the base sections 8 due to the engagement of the member 14 with the hole 20. At the same time, thermal deformation is allowed for due to the elastic deformation of the member 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for supporting a tank for storing liquefied gas, which is housed in the hull of the carrier for transporting liquefied gas, while allowing thermal deformation thereof. .

[0002]

Liquefied gas such as liquefied natural gas (LN)
G) and the like need to be transported in an extremely low temperature state of about -160 ° C. For transportation by a transport ship, a tank whose heat insulation effect is enhanced by a heat insulating material is housed in the hull, and liquefied gas is stored in the tank. It is performed in a stored state. In this case, since the temperature of the tank itself changes by about 200 ° C. before and after the injection of the liquefied gas, thermal deformation is accompanied by the temperature difference. Therefore, the tank support structure does not completely fix the tank to the hull, but it is necessary to realize a structure that supports the tank so as not to contact the inner wall of the hull while allowing thermal deformation.

Generally, as a structure for movably supporting a heavy object in the horizontal direction, there is a structure in which a metal plate is arranged on the lower surface of the heavy object and the heavy object slides on the metal plate. In this case, a sliding member made of a wear resistant material is interposed between the heavy object and the metal plate in order to prevent the heavy object from being worn due to the sliding of the heavy object and the metal plate.

[0004]

By the way, since the sliding member is a member for supporting a heavy object, it must be attached in a close contact state with the heavy object. In this case, it can be considered that the sliding member is securely fixed to the heavy object by a fastener such as a bolt. However, when the heavy object is a tank for transporting liquefied gas, the deformation amounts of these tanks before and after the injection of liquefied gas are different because the thermal expansion coefficients of the tank and the sliding member are different. It is considered that excessive stress is generated in the tool. On the other hand, if the mounting method is simply fitting the tank and the sliding member together without using a fastener, there is a disadvantage that the sliding member falls off from the tank due to an increase in the gap between them.
There is a problem that the work of inserting the sliding member into the tank must be done on site.

The present invention has been made in view of the above-mentioned circumstances. Even when thermal deformation occurs in the tank, the sliding member is kept attached to the tank and the thermal deformation is allowed while the tank is being deformed. It is an object of the present invention to provide a support structure capable of effectively supporting

[0006]

In order to achieve the above object, the present invention provides a plurality of base portions arranged on the bottom surface of a hull and a top surface of the base portion arranged in a protruding state on the lower surface of a tank. A frame provided with a sliding member that is brought into close contact and a sliding member mounting means that mounts the sliding member on the lower surface of the tank, the sliding member mounting means being fixed to the lower surface of the tank and inserting the sliding member from below. -Shaped mounting frame, an insertion hole formed in the side surface of the sliding member in the horizontal direction, and a plurality of mounting members having one end inserted into the insertion hole and the other end attached to the lower end surface of the mounting frame. Therefore, a supporting structure for a liquefied gas transportation tank is proposed in which the mounting member is formed in a strip plate shape bent in a crank shape.

[0007]

According to the liquefied gas transportation tank support structure of the present invention, the tank disposed inside the hull has the sliding member disposed on the lower surface thereof brought into close contact with the upper surface of the base portion on the bottom surface of the vessel. The thermal deformation of the tank, which is supported and before and after the injection of the liquefied gas, is allowed by sliding the sliding member and the base portion.

The sliding member is inserted from below into the mounting frame with one end of the mounting member being inserted into the insertion hole formed in the side surface, and the other end of the mounting member is fixed to the lower end surface of the mounting frame. , Held so that it does not fall out of the tank. Further, since the mounting member is bent in a crank shape, even if a gap is formed between the sliding member and the tank due to a dimensional error or thermal deformation, the bent portion of the mounting member is elastically deformed. As a result, the tank and the sliding member are held in close contact with each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a support structure for a liquefied gas transportation tank according to the present invention will be described below with reference to FIGS. In each of these drawings, symbol S is a hull, T is a tank, G is a liquefied gas, P is an inlet, 1 is an upper support means, 2
Is a lower support means, 3 is a chock, 4 is an upper stopper, 5
Is a transverse chock, 6 is a long chock, 7 ...
9 and 10 are sliding members, 8 is a base portion, 11 is a lower stopper, 12 is a sliding member mounting means, 13 is a mounting frame, 1
4 is a mounting member, 15 is a support plate, 16 is a liner, 1
Reference numeral 7 is a cutout portion, 18 is a bolt, 19 is a nut, 20 is an insertion hole, 21, 22 and 24 are spacers, and 23 is a slide base.

The support structure of this embodiment supports a tank T having a substantially rectangular parallelepiped shape, which is arranged in a state of being accommodated in the hull S, and upper support means 1 arranged on the upper surface of the tank T.
And a lower support means 2 arranged on the lower surface.
The tank T is, for example, a welded structure of an aluminum alloy, and as shown in FIGS. 4 and 5, is supported by the inner surface of the hull S at intervals of about 1 m. . Further, the tank T is provided on its upper surface with an inlet P for the liquefied gas G stored therein at a central position in the ship width direction and at a position deviated forward in the ship length direction.

The upper support means 1 includes a plurality of chocks 3 fixed to the upper surface of the tank T so as to project upward, and an upper stopper 4 provided on the ceiling surface of the hull S at positions corresponding to the chocks 3. It consists of and.

The chock 3 is provided with, for example, a rectangular parallelepiped block-shaped cushioning material (not shown) made of a wooden laminated material,
By bringing the cushioning material into contact with the upper stopper 4,
The movement of the tank in the contact direction can be restricted.

As shown in FIG. 6, the chock 3 includes a plurality of transverse chock 5 arranged in front of and behind the injection port P at regular intervals (for example, one in front and seven in rear). It is composed of a plurality of long chocks 6 (for example, two left and right) arranged at regular intervals on the left and right sides of the inlet P.

The upper stopper 4 is a welded structure fixed to the ceiling surface inside the hull P by welding. The upper stopper 4 is on the left and right of the transverse chock 5 and on the front and back of the long chock 6. And each chock 5
-It is arranged so as to sandwich 6.

As shown in FIGS. 4, 5 and 7, the lower support means 2 corresponds to a plurality of sliding members 7 mounted on the lower surface of the tank T so as to project downward. Bases 8 respectively arranged on the bottom of the hull S
It has and.

The sliding member 7 is a member made of wood laminated material formed in a rectangular parallelepiped block shape, and as shown in FIG. 7, a plurality of sliding members 7 (for example, 10 in front and rear) are provided over the entire lower surface of the tank T. Rows, 7 rows on the left and right) are arranged. Among these sliding members 7, the sliding member 9 in one row arranged in the center in the ship width direction and the sliding member 10 arranged in the second row from the front in the ship length direction are just the chocks on the upper surface of the tank T. As columns arranged vertically below 3, they also function as transverse chock and long chock, respectively. That is, these sliding members 9 and 10 include
At the positions close to each other by sandwiching the sliding members 9 and 10,
A lower stopper 11 is attached.

The sliding member 7 is provided with sliding member mounting means 12 for mounting the sliding member 7 on the lower surface of the tank T. As shown in FIG. 3, the sliding member mounting means 12 is a rectangular frame-shaped mounting frame 13 which is mounted on the lower surface of the tank T in an open state downward, and the mounting frame 13
And an attachment member 14 attached to the.

The mounting frame 13 has a flange surface 13a horizontally arranged at the lower end thereof. A plurality of through holes 13b are provided in the flange surface 13a,
A mounting member 14 and a support plate 15, which will be described later, can be mounted.

As shown in FIG. 2, a strip-plate liner 16 is arranged on the inner surface of the mounting frame 13, and the sliding member 14 is inserted inside the liner 16. It is like this. The liner 16 is arranged in the horizontal direction with a small gap with respect to the inner surface of the mounting frame 13, and is an L-shaped support plate that is mounted at four corners of the flange portion 13a of the mounting frame 13 with bolts 15a and nuts 15b. 15, the mounting frame 13
It is designed to be retained inside. Further, the liner 16 is provided with a space in the horizontal direction, and a cutout 17 is formed from the lower end thereof.
Is formed, and inside thereof, a mounting member 14 described later is formed.
Are arranged in a stored state.

The mounting member 14 is a crank-shaped strip plate member having a bent portion 14a at an intermediate position in the longitudinal direction, and has a width dimension that can be inserted into the cutout portion 17 of the liner 16. A small hole 14b is formed at one end of the mounting member 14 so as to match the through hole 13b of the flange portion 13a of the mounting frame 13, and is fixed to the mounting frame 13 by a bolt 18 and a nut 19. Has become.

Inserting holes 20 into which one end of the mounting member 14 can be inserted are formed at two locations on the pair of side surfaces facing each other of the sliding member 7 at intervals in the horizontal direction.

In order to fix the sliding member 7 to the tank T by such a sliding member mounting means 12, first, one end of the mounting member 14 is inserted into the insertion hole 20 of the sliding member 7, and the mounting frame is mounted. From below 13 the mounting frame 13
Insert inside. In this case, between the upper surface of the sliding member 7 and the lower surface of the tank T, and between the mounting member 14 and the mounting frame 13.
Spacers 21 and 22 having an appropriate thickness are provided between and. Thereby, the mounting member 14 and the mounting frame 13 can be easily brought into close contact with each other without forming a gap between the upper surface of the sliding member 7 and the lower surface of the tank T. Then, the small hole 14b of the mounting member 14 and the flange portion 1
With the through hole 13b of 3a aligned, the bolt 1
By fixing the mounting member 14 to the mounting frame 13 with the nut 8 and the nut 19, the sliding member 7 is mounted on the lower surface of the tank T in a close contact state.

As shown in FIG. 1, the base portion 8 is a seat made of a welded structure which is attached to the bottom surface of the hull S by welding, and the top surface of the base portion 8 is slidable to be brought into contact with the sliding member 7. It has a moving table 23. The sliding table 23 is
It is possible to adjust the height to any height by inserting the spacer 24 between the base portion 8 and all the base portions 8 and the sliding members 7 are adjusted so as to be placed in contact with each other. It is fixed to the base portion 8 in this state. As a result, the tank T is provided on the upper surface of the slide base 23 of the base portion 8.
Is slidably supported in the horizontal direction.

In the case where the tank T is supported by the supporting structure constructed as described above, when the liquefied gas G in a cryogenic state is injected into the tank T, the tank T itself changes in accordance with the temperature change from the room temperature state. Heat contraction occurs. Tank T
Is allowed to move horizontally only in the radial direction around the injection port P by the upper support means 1 and the lower support means 2, and is therefore displaced as shown by the chain line in FIGS. 6 and 7. At this time, the lower surface of the sliding member 7 of the lower support means 2 is slid on the upper surface of the sliding base 23 of the base portion 8 and is held in close contact with the upper surface of the sliding base 23 to support the tank T. Will be kept in a state.

On the contrary, even when thermal expansion occurs in the tank T when the liquefied gas G is discharged from the tank T, the support state by the upper support means 1 and the lower support means 2 is maintained. It will be.

Further, even when an external force is applied to the tank T due to swaying of the transport ship during navigation, the upper stopper 4 and the lower stopper 11 of the upper supporting means 1 and the lower supporting means 2 are slid on the chock 3 or slide. By contacting the side surface of the moving member 7, the displacement of the tank T is regulated, and the distance between the wall surface of the ship S and the tank T is maintained.

Here, by injecting the liquefied gas G into the tank T, when heat shrinkage occurs in the mounting frame 13 mounted on the tank T, the sliding member 7 which is brought into close contact with the tank T. Due to the difference in the amount of thermal deformation with
Stress will be generated in the mounting member 14. However, since the mounting member 14 of the present embodiment is bent in a crank shape, elastically deforming the bent portion 14a allows the stress to escape and be maintained in a healthy state.

As described above, according to the support structure of this embodiment, the sliding member 7 includes the mounting frame 13 and the mounting member 14.
By this, since it is held in the attached state on the lower surface of the tank T, the sliding member 7 can be attached in the manufacturing process of the tank T. Accordingly, it is possible to reduce the on-site work of mounting the sliding member 7 when the tank T is installed on the hull S. Further, since the sliding member 7 is configured to be inserted into the mounting frame 13 from below, the mounting work is easy and the spacers 21 and 22 for closely contacting the lower surface of the tank T can also be easily inserted. .

Further, since the mounting member 14 bent in a crank shape is used, the mounting member 14 and the sliding member 7 may be different from each other in the amount of thermal deformation or a mounting dimension error may occur. Also, by elastically deforming the bent portion 14a, the sliding member 7 can be held in close contact with the lower surface of the tank T without generating stress in the mounting member 14. As a result, the soundness of the mounting member 14 is maintained, and the tank T
The weight of can be reliably supported.

Moreover, by sliding the sliding member 7 on the sliding base 23 of the base portion 8, horizontal displacement is allowed, and the upper stopper 4 and the lower stopper 1 are provided.
By regulating the displacement direction by 1, the effect that the tank T can be supported soundly without restraining thermal deformation while maintaining the inlet P of the liquefied gas G at a fixed position.

The following techniques can be adopted in the support structure for the liquefied gas transport tank T according to the present invention. The transversal chock 5 and the long chock 6 are formed on the front and rear and right and left of the injection port P, and the sliding member 7 corresponding thereto is formed, but the chock constrained by the upper stopper 4 and the lower stopper 11. 3 and the sliding member 7 should be arranged radially around the inlet P. The interval, number, shape, etc. of the chock 3 and the sliding member 7 should be set arbitrarily. Although the mounting members 14 are provided at four places, the number and size of them may be set arbitrarily. The size of the gap between the mounting frame 13 and the sliding member 7 should be set arbitrarily.

[0032]

As described in detail above, the support structure for a liquefied gas transportation tank according to the present invention is arranged on the bottom surface of the inside of the hull and on the bottom surface of the tank so as to be in close contact with the base portion. A sliding member mounting means for mounting the sliding member on the lower surface of the tank, wherein the sliding member mounting means is
A frame-shaped mounting frame into which the sliding member is inserted from below,
The sliding member includes an insertion hole formed in a side surface and an attachment member having one end attached to the insertion hole and the other end attached to a lower end surface of the attachment frame. The attachment member is formed in a band plate shape bent in a crank shape. Therefore, the following effects are achieved. Since the mounting member is bent like a crank, even if a dimensional error between the sliding member and the mounting frame or a difference in the amount of thermal deformation occurs, the stress generated in the mounting member by elastically deforming the bent portion Can be reduced and the mounting member can be maintained in a healthy state. Since the sliding member can be mounted so as not to fall off the mounting frame, the mounting work of the sliding member can be carried out in the tank manufacturing factory, and the field work carried out in a narrow environment can be reduced. it can. Since the sliding member is configured to be inserted into the mounting frame arranged on the lower surface of the tank from below, the mounting work is easy and the number of working steps can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lower support means showing an embodiment of a support structure for a liquefied gas transportation tank according to the present invention.

FIG. 2 is a plan view showing a sliding member of the lower supporting means of FIG.

FIG. 3 is an enlarged sectional view showing a sliding member supporting means of FIG.

FIG. 4 is a vertical cross-sectional view showing the support structure of the liquefied gas transportation tank of FIG. 1 along the width direction of the tank and the hull.

5 is a vertical cross-sectional view of the tank and the hull of FIG. 4 along the ship length direction.

6 is a plan view of a tank showing a support structure for the liquefied gas transportation tank of FIG. 1. FIG.

7 is a bottom view of the tank showing the support structure of the liquefied gas transportation tank of FIG. 1. FIG.

[Explanation of symbols]

 G Liquefied gas P Gas inlet (inlet) S Hull T Tank 8 Base part 7 Sliding member 12 Sliding member mounting means 13 Mounting frame 14 Mounting member 20 Insertion hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruhiko Kimura 11-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima Harima Heavy Industries, Ltd. Aichi factory (72) Inventor Hiroyoshi Yamaguchi 11-1 Kitahama-cho, Chita-shi, Aichi Ishikawajima Harima Heavy Industries Ltd. Aichi factory

Claims (1)

[Claims] 1. A structure for supporting a tank for accommodating liquefied gas contained in a hull while allowing thermal deformation thereof, wherein a plurality of base parts arranged on a bottom surface of the hull and a bottom surface of the tank are provided. A sliding member, which is arranged in a protruding state and is brought into close contact with the upper surface of the base portion, and sliding member mounting means for mounting the sliding member on the lower surface of the tank, wherein the sliding member mounting means is fixed to the lower surface of the tank. A frame-shaped mounting frame into which the sliding member is inserted from below, an insertion hole formed in the side surface of the sliding member in the horizontal direction, and one end inserted into the insertion hole and the other end of the mounting frame. A support structure for a liquefied gas transportation tank, comprising a plurality of attachment members attached to a lower end surface, the attachment members being formed in a strip plate shape bent in a crank shape.