KR101567877B1 - Connecting Structure And Method For Insulation System - Google Patents

Abstract

A fastening structure and a fastening method of an adiabatic system are disclosed. The fastening structure of the adiabatic system of the present invention is a fastening structure of an adiabatic system provided in a cargo hold of a ship or an offshore structure, characterized in that the adiabatic system comprises first and second sealing walls and first and second adiabatic walls alternately laminated And the primary and secondary heat insulating walls are fixed to a lower portion of the secondary heat insulating wall by a support member into which the supporting structure is inserted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure and a fastening method of an insulation system, and more particularly, to a fastening structure and a fastening method of an insulation system which are provided in a cargo hold of a ship or an offshore structure, The present invention relates to a fastening structure for a heat insulating system and a fastening method for fastening primary and secondary heat insulating walls to a lower portion of a secondary heat insulating wall by a support member into which a supporting structure is inserted.

Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been regarded as a low-pollution energy source in various technical fields.

Natural gas is transported in a gaseous state through land or sea gas pipelines, or is transported to a remote location where it is stored in an LNG carrier in the form of liquefied natural gas (LNG). Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

The liquefied natural gas carrier is equipped with a cargo (also referred to as a storage tank) capable of storing and storing liquefied natural gas that has been liquefied by cooling the natural gas. Because the boiling point of liquefied natural gas is about -163 ° C at atmospheric pressure, the liquefied natural gas hold is made of materials that can withstand extremely low temperatures such as aluminum steel, stainless steel and 36% nickel steel to safely store and store liquefied natural gas And is designed to be resistant to thermal stress and heat shrinkage, and to prevent heat penetration.

LNG RV (Regasification Vessel), which transports LNG carriers and LNG for unloading LNG to land customers by landing LNG and landing on land, reclaiming stored LNG after arriving at land demand and unloading it into natural gas, Floating marine structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (FSRU) also include storage tanks installed in LNG carriers or LNG RVs.

In this way, a storage tank for storing LNG in a cryogenic condition is installed in a marine structure such as an LNG carrier, LNG RV, LNG FPSO, and LNG FSRU that transports or stores a liquid cargo such as LNG.

This storage tank can be classified as an independent tank type or a membrane type depending on whether the load of the cargo directly acts on the heat insulating material. Membrane type storage tanks are divided into GTT NO 96 type and TGZ Mark III type, and independent tank type storage tanks are divided into MOSS type and IHI-SPB type.

The above GTT type and TGZ type tank structures are described in U.S. Patent Nos. 6,035,795, 6,378,722, 5,586,513, and U.S. Patent Publication No. 2003-0000949, Korean Patent Laid-open Nos. 10-2000-0011347 and 10-2000- 0011346 and the like. Further, the structure of the independent tank type storage tank is described in Korean Patent No. 10-15063 and No. 10-305513.

The GTT NO 96 type storage tank is composed of a primary sealing wall and a secondary sealing wall made of Invar steel (36% Ni) 0.5 to 0.7 mm thick, a plywood box and a perlite ) And the like are alternately stacked on the inner surface of the hull.

In the case of the GTT NO 96 type, the primary sealing wall and the secondary sealing wall have almost the same degree of liquid tightness and strength, so that the secondary sealing wall can safely support the cargo for a considerable period of time in the leakage of the primary sealing wall . In addition, since the membrane of GTT NO 96 type is linear, it is easier to weld than TGZ Mark Ⅲ type corrugated membrane, and the rate of automation is higher than that of TGZ Mark Ⅲ type. However, overall welding length is longer than that of TGZ Mark Ⅲ type. In case of GTT NO 96 type, Double Couple is used to support the insulation box (ie, insulation wall). French Patent Nos. 2146612, 2629897, 2683786, etc. disclose the construction and fixing method of a conventional GT NO 96 type heat insulating box.

In cargo holds containing liquefied natural gas, insulation and safety are particularly important. Since cryogenic liquefied natural gas is sensitive to temperature changes, if heat outside the hull penetrates into the cargo hold, the liquefied natural gas is vaporized and the vaporized natural gas is discharged to the outside for combustion or fuel . Therefore, the insulation of the cargo holds is very important for the transportation efficiency, and the cargo hold has the insulation system. The fastening structure in such an adiabatic system is a part directly related to problems of heat insulation maintenance and leakage prevention of the cargo hold, and structural stability of the cargo hold.

The present invention proposes a fastening structure of an insulation system that is structurally robust and can maintain the heat insulation of a cargo hold.

According to an aspect of the present invention, there is provided a fastening structure for a heat insulating system provided in a cargo hold of a ship or an offshore structure,

The heat insulating system includes a primary sealing wall, a primary heat insulating wall, a secondary sealing wall and a secondary heat insulating wall alternately stacked,

Wherein the primary and secondary heat insulating walls are fixed to a lower portion of the secondary heat insulating wall by a support member into which the supporting structure is inserted.

Preferably, the ship or an offshore structure has a plurality of adhesive members spaced from each other on the inner wall of the hull, a second bottom plate disposed on the adhesive member, the second insulating plate provided on the second bottom plate, The support member includes an insertion fixing part having a circular cross section and having a hole for inserting the supporting structure at an upper end thereof and a connection part having a wider cross section than the insertion fixing part and having a top surface adhered to the lower part of the secondary bottom plate .

Preferably, the insertion and fixing portion is formed in a shape of a truncated cone or a cylindrical shape having a circular cross section and provided with holes through which the support structure is inserted, and the bottom plate may be processed so that the insertion and fixing portions can penetrate therethrough have.

Preferably, the support structure is inserted into the hole of the insertion fixing part and then the lower end of the supporting structure is fastened with a nut at the inside of the insertion fixing part and the insertion fixing part of the support member passes through the secondary bottom plate And the upper surface of the connection portion is brought into close contact with the lower portion of the second bottom plate, and then the second bottom plate is riveted.

Preferably, the adhesive member may be one of mastic and resin provided on the inner wall of the hull.

Preferably, a primary top plate is interposed between the primary sealing wall and the primary heat insulating wall, and a spring support coupled to the upper end of the supporting structure by a fixing stud is coupled to the upper surface of the primary top plate. .

Preferably, the spring support includes an upper structure to which one end is fastened to the upper surface of the primary top plate, a lower structure to which one end is screwed to the fixing stud, and a spring portion provided between the upper and lower structures .

Preferably, a hole is formed in the secondary sealing wall so as to penetrate the fixing stud, and the fixing stud penetrates through the hole of the secondary sealing wall and is inserted into the upper structure of the supporting structure and the lower structure of the spring support Can be screwed together.

Preferably, both ends of the fixing stud are inserted and screwed into the upper end of the supporting structure and the lower end of the lower structure, respectively, and the body of the fixing stud can be welded to the secondary sealing wall.

Preferably, a primary bottom plate having a hole is formed between the secondary sealing wall and the primary heat insulating wall so that the fixing stud can pass therethrough, and between the secondary sealing wall and the secondary heat insulating wall, A secondary top plate having a hole through which the upper end of the structure can penetrate can be interposed.

Preferably, the cargo hold may be a membrane-type storage tank for storing liquefied natural gas.

According to another aspect of the present invention, there is provided a method for fastening an insulating system provided in a cargo hold of a ship or an offshore structure, the primary sealing wall and the primary insulating wall, and the secondary sealing wall and the secondary insulating wall are alternately laminated ,

A spring structure support for absorbing a shearing force is provided between the secondary sealing walls at the lower portion of the primary sealing wall,

The lower end of the support structure is inserted into the upper end of the support member and the lower end of the support member is riveted to the lower portion of the plate below the secondary heat insulating wall ,

And a fastening stud is inserted into the upper end of the support and the upper end of the support structure to screw them together.

Preferably, the support member may be either a truncated cone shape having a circular cross section or a cylindrical shape with a hole through which the support structure is inserted at an upper end thereof.

According to another aspect of the present invention, there is provided a method of fastening an insulating system provided in a cargo hold of a ship or an offshore structure, comprising a primary sealing wall and a primary insulating wall, and a secondary sealing wall and a secondary insulating wall alternately stacked As a result,

A plurality of adhesive members are provided on the inner wall of the hull so as to be spaced apart from each other, a bottom plate of the secondary heat insulating wall is disposed on the adhesive member,

A support structure is provided between the secondary heat insulating wall and the secondary heat insulating wall, the lower end of the support structure is inserted into the upper end of a truncated cone or columnar support member, and the lower end of the support member is rivet- So,

Wherein the support member is not in direct contact with the inner wall of the hull of the marine structure or the marine structure.

Preferably, a support having a spring structure for absorbing a shearing force is provided between the secondary sealing walls at the lower portion of the primary sealing wall, and a fixing stud is inserted into the upper end of the supporting structure and the upper end of the supporting structure, have.

In the present invention, the primary and secondary heat insulating walls are fixed to the lower part of the secondary heat insulating wall with a frustum-shaped or cylindrical support member into which the supporting structure is inserted, and a shear force is applied between the lower part of the primary sealing wall and the secondary sealing wall And the lower end of the spring support and the upper end of the support structure are connected to each other by the fixing stud.

Such a fastening structure can stably fix the adiabatic system, and in particular, a truncated cone or columnar support member into which the supporting structure is inserted can distribute the load, thereby maintaining the rigidity of the adiabatic system fastening structure.

In addition, the shear force can be absorbed in the spring support, the shear force transmitted to the support structure and the support member can be reduced, and the spring support and the support structure can be connected by the fixing stud to the lower portion of the secondary heat- So that the rigidity of the fastening structure can be further enhanced.

1 schematically shows a cross-sectional view of an adiabatic system to which a fastening structure according to an embodiment of the present invention is applied.
2 is an exploded perspective view of the adiabatic system of the embodiment shown in Fig.
Fig. 3 separately shows only the support members in the embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 1 schematically shows a cross-sectional view of an adiabatic system to which a fastening structure according to an embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view showing a fastening method of the adiabatic system of this embodiment in more detail.

As shown in Figs. 1 and 2, the fastening structure of the adiabatic system of this embodiment is a fastening structure of a heat insulating system provided in a cargo hold of a ship or an offshore structure.

The cargo hold to which this embodiment is applied is a membrane type storage tank for storing liquefied natural gas, for example, a NO 96 type storage tank. Since the liquefied natural gas is at a cryogenic temperature of about -163 ° C, the cargo hold in which the liquefied natural gas is stored is provided with a heat insulating structure to block heat input and output. In the case of the membrane type storage tank, a double heat insulating wall may be provided so as to block heat input / output between the shell and the inner wall H of the ship, and a sealing wall having airtightness may be provided between the heat insulating walls.

Insulating material (not shown) such as polyurethane foam, glass wool, PVC foam is provided inside the double insulation wall, and the sealing wall is made of metal. Particularly, the primary sealing wall that directly contacts the liquefied natural gas can be made of SUS, Invar steel, etc., which can withstand the cryogenic temperature of liquefied natural gas.

The insulation system of such a cargo hold is formed by alternately stacking primary (not shown) and secondary sealing walls 10 and primary and secondary insulating walls 100, 200 alternately as shown in FIG. 1, The primary and secondary heat insulating walls 100 and 200 are fixed to the lower portion of the secondary heat insulating wall 200 through the support member 400 into which the structure 300 is inserted.

A plurality of adhesive members 20 spaced from each other are provided on the inner wall H of the ship hull of the ship hull and a second bottom plate 220 is provided on the adhesive member 20, And a secondary insulation wall 200 is provided. The adhesive member 20 may be, for example, a mastic or a resin. By providing the secondary bottom plate 220 on the plurality of adhesive members 20 spaced apart as described above, The heat insulating system can be fixed while blocking heat transfer from the heat insulating system to the heat insulating system. The secondary bottom plate 220 disposed on the adhesive member 20 may be provided, for example, as a plywood.

The support member 400 includes an insertion fixing part 410 having a circular cross section and a hole for inserting the supporting structure 300 at an upper end thereof and a second bottom plate And a connection part 420 having an upper surface adhered to the lower part of the base part 220.

3, the insertion fixing part 410 of the support member 400 includes a truncated conical shape 400B or a cylindrical shape 400A having a circular shape with a hole through which the supporting structure 300 is inserted, And the bottom plate 220 is processed so that the insertion fixing portions 410A and 410B can pass through. The cylindrical shape 400A is advantageous relative to the processing of the relative part such as the secondary bottom plate 220 to which the support member is inserted and contacted and the secondary part of the secondary heat insulating wall 200. The truncated cone shape 400B, Is relatively difficult, but it has the advantage of being able to withstand high stresses, so that a shape suitable for each application environment can be applied.

FIG. 2 shows a fastening structure to which a secondary bottom plate 220 having a circular hole is inserted so that the columnar support member 400 can pass therethrough.

2, the insertion fixing part 410 of the support member 400 is disposed to pass through the second bottom plate 220 on the upper part of the adhesive member 20 disposed on the inner wall H of the hull, The upper surface of the second bottom plate 220 is brought into close contact with the lower surface of the second bottom plate 220. Between the secondary sealing wall 10 and the secondary heat insulating wall 200 is disposed a secondary top plate 210 having a hole through which the upper end of the supporting structure 300 can pass, The lower end of the supporting structure 300 is inserted into the hole of the insertion fixing part 410 through the secondary top plate 210 and the secondary heat insulating wall 200.

The lower end of the supporting structure 300 arranged as described above is fastened (430) by inserting a nut at the inside of the insertion fixing part 410 and the upper surface of the connecting part 420 of the supporting member 400 is in close contact with the lower part of the bottom plate (440) by rivet fastening to the secondary bottom plate (220).

The connection member 420 of the support member 400 is fixed to the lower portion of the second bottom plate 220 so that the support member 400 does not directly contact the inner wall H of the ship, The heat transfer to the inside of the cargo hold through the fastening portion in the insulating system can be more effectively blocked.

On the other hand, the upper fastening structure of the cargo hold insulation system is as follows.

A primary top plate 110 is interposed between a primary sealing wall (not shown) that directly contacts the liquefied natural gas and the primary heat insulating wall 100. The spring support 500 And the lower end of the spring support 500 is fastened to the upper end of the support structure 300 with a fixing stud 600 to be engaged.

1, the spring support 500 includes an upper structure 510 and a lower structure 500. The upper structure 510 is coupled to the upper surface of the primary top plate 110 at one end thereof. And a spring portion 530 provided between the upper and lower structures 520 and 520. [

The upper end of the upper structure 510 of the spring support 500 is fastened to the upper surface of the primary top plate 110 by screwing or riveting. The upper structure 510 and the lower structure 520 of the spring support 500 each have a columnar body and a head having a larger cross-sectional area than the body. The upper structure 510 and the lower structure 520, And the spring portion 530 is fitted between the portions.

A hole is formed in the secondary sealing wall 10 so that the fixing stud 600 penetrates the hole of the secondary sealing wall 10 while the fixing stud 600 penetrates the hole of the secondary sealing wall 10, And can be screwed to the lower structure 520 of the support 500.

Both ends of the fixing stud 600 are respectively inserted and screwed into the upper end of the supporting structure 300 and the lower end of the lower structure 520. The body portion of the fixing stud 600 is welded to the secondary sealing wall 10 Can be combined.

Between the secondary sealing wall 10 and the primary heat insulating wall 100, there is interposed a primary bottom plate 120 having holes formed therein so that the fixing stud 600 can pass therethrough. The primary bottom plate 120, the primary top plate 110, and the secondary top plate 210 may be made of plywood as in the secondary bottom plate 220 described above.

As described above, the adiabatic system in this embodiment is provided in a cargo hold of a ship or an offshore structure, and the primary and secondary sealing walls 10 and the primary and secondary insulating walls 100, 200 are alternately stacked A support having a spring structure for absorbing a shearing force is provided between the secondary sealing walls 10 at the lower part of the primary sealing wall and a support having a spring structure is provided between the secondary sealing walls 10 at the lower part of the secondary sealing wall 10, A support structure 300 is provided and fastened. Particularly, the lower end of the support structure 300 is inserted into the upper end of the truncated conical or cylindrical support member 400 of the circular cross section, and the lower end of the support member 400 is riveted to the lower portion of the plate under the secondary heat insulating wall 200 , The fixing stud 600 is inserted into the lower end of the support and the upper end of the supporting structure 300 and screwed together.

The load is dispersed by the frusto-conical or cylindrical support member 400 while the shear force is absorbed by the spring supporter 500. The fixing stud 600 is fixed to the primary heat insulating wall 100 from the upper portion of the primary heat insulating wall 100, By tightening to connect to the lower end of the wall 200, the structural rigidity and stability of the adiabatic system can be enhanced and the safety of the cargo hold can be ensured.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

H: Hull inner wall (Hull)
10: Secondary sealing wall
20:
100: Primary insulation wall
110: primary top plate
120: primary bottom plate
200: Secondary insulation wall
210: Secondary top plate
220: Secondary bottom plate
300: support structure
400: Support member
410:
420:
430: Nuts
440: Rivet
500: Spring Support
510: superstructure
520:
530: spring portion
600: Fixing studs

Claims (15)

In a fastening structure of a heat insulating system provided in a cargo hold of a ship or an offshore structure,
The adiabatic system includes a primary sealing wall, a primary insulating wall, a secondary sealing wall, and a secondary insulating wall in this order,
Wherein a plurality of adhesive members spaced apart from each other and a second bottom plate disposed on an adhesive member are provided on the inner surface of the hull of the ship or an offshore structure and the secondary heat insulating wall is provided on the upper surface of the second bottom plate,
Wherein the primary and secondary heat insulating walls are fixed to a lower portion of the secondary heat insulating wall by a support member into which the supporting structure is inserted,
Wherein the support member includes an insertion fixing part having a hole for inserting the supporting structure at an upper end thereof and a connection part having a wider cross section than the insertion fixing part and having an upper surface adhered to the lower part of the secondary bottom plate Fastening structure. The method according to claim 1,
Wherein the inserting / fixing portion has a circular cross section. The method according to claim 1,
Wherein the insertion and fixing portion is either a truncated cone shape having a circular cross section or a cylindrical shape with a hole through which the support structure is inserted,
And the secondary bottom plate is machined to allow the insertion and fixing portion to pass therethrough. The method of claim 3,
Wherein the support structure is fixed to the lower end of the support structure after being inserted into the hole of the insertion fixture by nut fastening in the insertion fixture,
Wherein the insert fixing portion of the support member penetrates through the secondary bottom plate and the upper surface of the connection portion is brought into close contact with the lower portion of the secondary bottom plate and is then riveted to the secondary bottom plate. The method according to claim 1,
Wherein the adhesive member is one of mastic and resin provided on the inner wall of the hull. The method according to claim 1,
A primary top plate is interposed between the primary sealing wall and the primary heat insulating wall,
And a spring support fastened to the upper end of the support structure by a fixing stud is coupled to the upper surface of the primary top plate. 7. The apparatus of claim 6, wherein the spring support
An upper structure having one end coupled to an upper surface of the primary top plate;
A lower structure having one end thereof screwed to the fixing stud; And
And a spring portion provided between the upper and lower structures. 8. The method of claim 7,
Holes are formed in the secondary sealing wall so that the fixing stud penetrates through the secondary sealing wall,
Wherein the fixing stud penetrates through the hole of the secondary sealing wall and is screwed to the upper end of the supporting structure and the lower structure of the spring support. 9. The method of claim 8,
Wherein both ends of the fixing stud are inserted and screwed into the upper end of the supporting structure and the lower end of the lower structure, respectively, and the body of the fixing stud is welded to the secondary sealing wall. 10. The method of claim 9,
A primary bottom plate having a hole is formed between the secondary sealing wall and the primary heat insulating wall so that the fixing stud can pass therethrough,
Wherein a secondary top plate having a hole through which the upper end of the supporting structure is formed is interposed between the secondary sealing wall and the secondary heat insulating wall. The method according to claim 1,
Wherein the cargo hold is a membrane type storage tank for storing liquefied natural gas. A method for fastening an insulating system, which is provided in a cargo hold of a ship or an offshore structure and is formed by alternately laminating a primary sealing wall, a primary insulating wall, a secondary sealing wall and a secondary insulating wall,
A spring structure support for absorbing a shearing force is provided between the secondary sealing walls at the lower portion of the primary sealing wall,
The lower end of the support structure is inserted into the upper end of the support member and the lower end of the support member is riveted to the lower portion of the plate below the secondary heat insulating wall ,
And a fixing stud is inserted into the lower end of the support and the upper end of the supporting structure to screw them together. 13. The method of claim 12,
Wherein the support member is either a truncated cone shape having a circular cross section or a cylindrical shape with a hole through which the support structure is inserted at an upper end thereof. A method for fastening an insulation system provided in a cargo hold of a ship or an offshore structure and comprising a primary sealing wall and a primary heat insulating wall, and a secondary sealing wall and a secondary heat insulating wall alternately laminated,
A plurality of adhesive members are provided on the inner wall of the hull so as to be spaced apart from each other, a bottom plate of the secondary heat insulating wall is disposed on the adhesive member,
A support structure is provided between the secondary heat insulating wall and the secondary heat insulating wall, the lower end of the support structure is inserted into the upper end of a truncated cone or columnar support member, and the lower end of the support member is rivet- So,
Wherein the support member does not directly contact the inner wall of the hull of the ship or the offshore structure. 15. The method of claim 14,
A spring structure support for absorbing a shearing force is provided between the secondary sealing walls at the lower portion of the primary sealing wall,
And a fixing stud is inserted into the lower end of the support and the upper end of the supporting structure to screw them together.

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