KR101349875B1 - Fixing structure of reinforcing member for primary barrier of lng storage tank - Google Patents

Abstract

A fixing structure for a primary barrier reinforcing member of a liquefied natural gas storage tank is disclosed. The fixing structure for the primary barrier reinforcing member of the liquefied natural gas storage tank according to the embodiment of the present invention, the reinforcing member for reinforcing the pleats of the primary barrier located inside the liquefied natural gas storage tank is fixed to the primary barrier A fixing structure for a reinforcing member, wherein the primary barrier includes a first wrinkle portion, a second wrinkle portion arranged in a direction perpendicular to the first wrinkle portion, and an intersection where the first wrinkle portion and the second wrinkle portion cross each other. The fixing structure for the reinforcing member is formed separately from the first fixing member and the first fixing member which are inserted and fixed below the cross section so as to fix the first reinforcing member positioned below the first pleating portion, and is located below the second pleating portion. And a second fixing member inserted and fixed below the first fixing member so as to fix the second reinforcing member.

Description

FIXING STRUCTURE OF REINFORCING MEMBER FOR PRIMARY BARRIER OF LNG STORAGE TANK}

The present invention relates to a fixed structure for a primary barrier reinforcing member of a liquefied natural gas storage tank.

Liquefied natural gas storage tank is for storing or transporting cryogenic natural gas (Liquefied Natural Gas, LNG) at about -163 ° C and has two barriers (primary and secondary barrier) to seal liquefied natural gas. do.

The liquefied natural gas storage tank has a plywood structure in a heat insulating member made of polyurethane foam having a low thermal conductivity between a primary barrier and a secondary barrier, a secondary barrier and an inner hull, A heat insulating layer is formed by using a heat insulating board having a heat insulating member protecting plate having a high compressive strength.

At this time, since the primary barrier of the liquefied natural gas storage tank is in direct contact with the liquefied natural gas, high airtightness is required. The liquefied natural gas storage tank is welded to a plurality of barrier sheets made of stainless steel to form a primary barrier. When these primary barriers contact the cryogenic liquefied natural gas, heat shrinkage occurs. When the heat shrinkage occurs, It can be damaged by stress.

Because of this problem, the primary barriers have corrugations to have low in-plane stiffness. The crease reduces the thermal stress at the welded area by deforming a certain amount when heat shrinkage occurs.

On the other hand, when the liquefied natural gas storage tank storing the liquefied natural gas is transported by a transportation means such as a ship, the surface of the liquefied natural gas stored by the movement such as rolling, pitching, It may occur.

Such sloshing is referred to as sloshing, and this sloshing applies a large compressive force to the primary walls. If the compressive force by the sloshing exceeds the yield strength of the primary barriers, the safety of the primary barriers may deteriorate due to permanent deformation in the wrinkles most vulnerable to deformation.

Accordingly, the primary walls must have a low surface rigidity in correspondence with the heat shrinkage, and a high pressure resistance performance corresponding to the compressive force due to the occurrence of sloshing.

In order to improve the pressure resistance performance of the primary barrier, the applicant of the present invention has proposed a structure for installing a reinforcing member under the pleats of the primary barrier, as disclosed in the application No. 10-2008-0091085.

However, such a reinforcing member has a structure that is not fixed to the pleats of the primary barrier, there is a problem that it is not easy to install the reinforcement member under the pleats of the primary barrier.

Patent Document 1: Korean Patent Application No. 10-2008-0091085

One embodiment of the present invention is to provide a fixing structure for the reinforcing member for reinforcing the rigidity of the primary barrier corrugated portion located inside the LNG tank.

According to one aspect of the invention, the reinforcing member for fixing the reinforcing member for reinforcing the pleats of the primary barrier located inside the liquefied natural gas storage tank to the primary barrier, the primary barrier is A first pleated portion, a second pleated portion arranged in a direction perpendicular to the first pleated portion, and an intersection where the first pleated portion and the second pleated portion intersect, wherein the fixing structure for the reinforcing member includes: 1 is inserted into one end of the first reinforcing member to fix the first reinforcing member positioned below the pleats, and the other side is separated from the first fixing member and the first fixing member which are inserted and fixed under the cross section. Is formed, one side is inserted into one end of the second reinforcing member to fix the second reinforcing member located below the second pleats and the other side is the first fixing member The fixing structure of the first rear wall reinforcing member including a second holding member that is inserted in the fixed side is provided.

In this case, the first fixing member may include a first protrusion that is inserted into and fixed to a first insertion groove formed in the lower side of the intersection and a first extension that extends from the first protrusion to support the first reinforcing member. Can be.

In this case, the first extension part may be formed in a pair, and the pair of first extension parts may be formed to extend in both lateral directions of the first protrusion.

Meanwhile, the first protrusion may be shape-fitted to the first insertion groove.

Meanwhile, the first extension part may be inserted into one end portion of the first reinforcement member to support the first reinforcement member.

In this case, the second fixing member may include a second protrusion that is inserted into and fixed to a second insertion groove formed in the lower side of the first protrusion, and a second extension that extends from the second protrusion to support the second reinforcing member. can do.

In this case, the second extension part may be formed in a pair, and the pair of second extension parts may be formed to extend in both lateral directions of the second protrusion.

Meanwhile, the second protrusion may be shape-fitted to the second insertion groove. Meanwhile, the second extension part may be inserted into one end portion of the second reinforcement member to support the second reinforcement member.

The first extension part and the second extension part may be formed in a plate shape corresponding to the inner shapes of the first reinforcement member and the second reinforcement member, respectively.

Meanwhile, the first fixing member and the second fixing member may be made of a metal plate.

On the other hand, the first and second extensions may be formed obliquely such that the first and second extensions are inclined upward toward the respective end sides of the first and second extensions, respectively.

The fixing structure for the primary barrier reinforcing member of the liquefied natural gas storage tank according to an embodiment of the present invention is to easily fix the reinforcing member for reinforcing the stiffness of the pleats provided in the primary barrier to the pleats of the primary barrier. Can be.

1 is a perspective view of a primary barrier of a liquefied natural gas storage tank.
Figure 2 is a perspective view of the pleats and intersections of the primary barrier of the LNG storage tank.
3 is a plan view of the pleats and intersections of the primary barrier of the LNG storage tank.
4 is a perspective view from below of the pleats and intersections of the primary barrier of the LNG storage tank.
5 is a perspective view of a fixing structure for a reinforcing member according to an embodiment of the present invention.
6 is a plan view of a first fixing member and a second fixing member according to an embodiment of the present invention.
7 is a perspective view of the fixing structure for a reinforcing member according to an embodiment of the present invention, viewed from below.
8 is a perspective view of the reinforcing member fixed to the pleats of the primary barrier by the fixing structure according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Prior to describing the fixing structure for the primary barrier reinforcing member of the liquefied natural gas storage tank according to an embodiment of the present invention, the structure of the primary barrier to which the reinforcing member is installed according to an embodiment of the present invention will be described first. do.

1 is a perspective view of a primary barrier. 2 is a perspective view of the pleats and intersections of the primary barrier. 3 is a plan view of the pleats and intersections of the primary barrier. 4 is a perspective view of the wrinkles and intersections of the primary barrier viewed from below.

Referring to FIG. 1, the primary barrier 10 of liquefied natural gas extends in the x-axis direction and protrudes in the z-axis direction in the x-axis direction and extends in the y-axis direction in the z-axis. And a second pleat 14 protruding in the direction.

The first wrinkle portion 12 and the second wrinkle portion 14 are formed in a lattice shape as a whole with a plurality of wrinkle portions being spaced apart from each other in the x-axis direction and the y-axis direction.

The intersecting portion 16 is formed at a position where the first wrinkle portion 12 and the second wrinkle portion 14 intersect.

2 to 4, the intersection portion 16 is formed with a protrusion 18 protruding in the z-axis direction at a position where the first wrinkles 12 and the second wrinkles 14 intersect. The first groove 21 and the second groove 23 formed in parallel with the extension direction of the second wrinkled portion 14 are formed at both sides of the protrusion 18 in the extending direction of the first wrinkled portion 12.

A triangular first side surface 22 is formed between the protrusion 18 and the first groove 21, and a triangular second side surface 24 is formed between the protrusion 18 and the second groove 23. .

Recesses 25 and 27 are formed on both side portions of the projecting portion 18 in the extending direction of the second wrinkle portion 14. [

Meanwhile, referring to FIGS. 1 to 4, since the primary barrier 10 is formed of a plate, the first and second wrinkles 12 and 14 of the primary barrier are formed in a curved surface. The lower part of the first wrinkle part 12, the lower part of the second wrinkle part 14, and the lower part of the intersection part 16 are formed as empty spaces. At this time, the lower surface of the first corrugation portion 12 and the lower surface of the second corrugation portion 14 are formed in a curved surface.

In the lower portion of the intersection portion 16, an inclined surface 31 having a substantially triangular shape and a first folded surface 32 and a second folded surface 34 positioned on both sides of the inclined surface 31 are second corrugated portions. It is formed symmetrically with respect to the extension direction centerline C of (14). In addition, a first insertion groove 39 is formed between the first folding surface 32 and the second folding surface 34 facing each other.

In this case, the protrusions 18, the first and second grooves 21 and 23, and the recesses 25 and 27 formed at the intersection 16 of the primary barrier 10 may be formed of a plate-shaped primary barrier ( 10) is formed by pressing the corners of each part can be formed to be bent.

The fixing structure for the primary barrier reinforcement member according to an embodiment of the present invention is inserted into and fixed inside the intersection 16 of the primary barrier 10 as shown in FIGS. 1 to 4 to crimp the reinforcement member ( 12, 14) It is a structure for supporting and fixing the lower part. Hereinafter, the fixing structure for the primary barrier reinforcing member according to an embodiment of the present invention will be described in more detail with reference to the drawings.

5 is a perspective view of a fixing structure for a reinforcing member according to an embodiment of the present invention. 6 is a plan view of a first fixing member and a second fixing member according to an embodiment of the present invention. 7 is a perspective view of the fixing structure for a reinforcing member according to an embodiment of the present invention, viewed from below. 8 is a perspective view of the reinforcing member fixed to the pleats of the primary barrier by the fixing structure according to an embodiment of the present invention.

1 and 5 to 8, a fixing structure for a reinforcing member according to an embodiment of the present invention includes a first fixing member 100 and a second fixing member 300.

The first fixing member 100 includes a first protrusion 110 and first extensions 130 and 150. The first fixing member 100 is formed to be inserted and fixed below the intersection 16 of the primary barrier 10.

In this case, the first protrusion 110 may be formed to protrude so as to be inserted into and fixed to the first insertion groove 39 (see FIG. 4) formed at the lower side of the intersection 16. In more detail, the first protrusion 110 is formed to be shape-fitted and fixed to the first insertion groove 39 (see FIG. 4). That is, the first protrusion 110 corresponds to the shape of the first insertion groove 39 (refer to FIG. 4) formed below the intersection 16 of the primary barrier 10. It can have a variety of shapes that can be inserted and fixed.

On the other hand, the first extension portion 130, 150 according to an embodiment of the present invention, the first reinforcing member (230, 270) so that the first protrusion 110 so as to support and secure the lower surface of the wrinkle portion of the primary barrier (10) Is formed extending from).

5 and 6, the first extension parts 130 and 150 are formed in a pair. In more detail, the first extensions 130 and 150 are formed to extend by a predetermined length in both lateral directions about the first protrusion 110.

According to one embodiment of the present invention, as shown in FIG. 8, in order to fix the first reinforcing members 230 and 270 to the lower portion of the second pleats 14, the first extensions 130 and 150 may be formed. 1 may be inserted into one end of the reinforcing members (230, 270).

At this time, the first extension parts 130 and 150 are inserted into the ends of the pipe-shaped first reinforcing members 230 and 270 having a curved surface corresponding to the lower surface of the second corrugation part 14.

5 and 8, the first extensions 130 and 150 may be coupled to the first reinforcement member such that the first extensions 130 and 150 are fixedly coupled inside the ends of the first reinforcement members 230 and 270. It may be made of a plate shape corresponding to the internal shape of (230, 270). However, the present invention is not limited thereto, and the first extension parts 130 and 150 may have various shapes that may be fixedly coupled to the ends of the first reinforcing members 230 and 270.

In addition, the plate shape such that the first extension portion 130, 150 is inclined upward toward the end side of the first extension portion 130, 150 from the first protrusion 110, the first extension portion 130, 150 is connected The first extension portions 130 and 150 may be formed obliquely upward.

As a result, when the first extension parts 130 and 150 are inserted into and fixed to the first reinforcement members 230 and 270 as illustrated in FIG. 8, the first reinforcement members 230 and 270 may have a second wrinkle portion ( It may be in close contact with the inner surface of the 14 to support the inner surface of the second pleats 14.

Meanwhile, referring to FIGS. 5 to 8, a second part, which will be described later, is formed separately from the first fixing member 100 to support and fix the second reinforcing members 210 and 250 positioned below the first pleats 12. The fixing member 300 is inserted and fixed below the first fixing member 100. Hereinafter, the second fixing member 300 of the fixing structure for the reinforcing member according to the embodiment of the present invention will be described.

6 and 7, the second fixing member 300 includes a second protrusion 310 and second extensions 330 and 350. The second fixing member 300 is formed to be inserted and fixed to the lower side of the first protrusion 110 of the first fixing member 100. At this time, the second fixing member 300 is vertically coupled to the first fixing member 100 at the lower side of the first fixing member 100.

The second protrusion 310 according to the exemplary embodiment of the present invention may have a shape protruding to be inserted into and fixed to the second insertion groove 170 formed on the lower surface of the first protrusion 110. In more detail, the second protrusion 310 is formed to be shape-fitted to the second insertion groove 170 and fixed in position.

That is, the second protrusion 310 may have various shapes that can be inserted and fixed to the second insertion groove 170 corresponding to the shape of the second insertion groove 170 formed on the lower surface of the first protrusion 110.

Meanwhile, referring to FIGS. 5 to 8, the second extension parts 330 and 350 according to the embodiment of the present invention have the second reinforcing members 210 and 250 having the lower side of the pleats of the primary barrier 10. It extends in one direction from the second protrusion 310 to support and secure.

In addition, the second extension parts 330 and 350 are formed in a pair. In more detail, the second extensions 330 and 350 are formed to extend by a predetermined length in both lateral directions about the second protrusion 310.

Like the first extensions 130 and 150, in order to fix the second reinforcement members 210 and 250 to the lower portion of the first pleats 12, the second extensions 330 and 350 may include the second reinforcement member ( It may be inserted into one end of the 210, 250.

In addition, the second extension parts 330 and 350 are inserted into the ends of the pipe-shaped second reinforcing members 210 and 250 having curved surfaces corresponding to the lower surfaces of the first pleats 12.

As described above, the second extensions 330, 350 are second reinforcing members 210, 250 such that the second extensions 330, 350 are fixedly coupled within the ends of the second reinforcing members 210, 250. It may be made of a plate shape corresponding to the internal shape of.

Like the first extensions 130 and 150, the shapes of the second extensions 330 and 350 are not limited thereto and may have various shapes that may be fixedly coupled to the ends of the second reinforcing members 210 and 250. Can be.

In addition, the plate shape such that the second extension portion 330, 350 is inclined upward toward the end side of the second extension portion 330, 350 from the second protrusion portion 310 to which the second extension portion 330, 350 is connected. The second extension parts 330 and 350 may be formed obliquely upward.

On the other hand, the first fixing member 100 and the second fixing member 300 according to an embodiment of the present invention may be made of a metal plate. More specifically, the first protrusion 110, the first extension 130, 150, the second protrusion 310 and the second extension 330, 350 are metals that can withstand the cryogenic LNG storage tank. It may be a plate. For example, the metal plate may be made of aluminum or stainless steel (SUS).

Meanwhile, the first protrusions 110, the first extension parts 130 and 150, the second protrusion part 310, and the second extension parts 330 and 350 may include the first and second reinforcing members 210, 230, 250, It may be made of a metal plate of the same material as 270). In general, the reinforcing members 210, 230, 250, and 270 may be made of a material lower than the hardness of the primary barrier 10 in order to reduce frictional damage with the primary barrier 10.

For example, when the primary barrier 10 is made of stainless steel, the reinforcing members 210, 230, 250, and 270 are made of a material having a hardness lower than that of stainless steel, such as aluminum or brass. Can be. Accordingly, the first protrusion 110, the first extension 130, 150, the second protrusion 310, and the second extension 330, 350 are made of the same material as the reinforcing members 210, 230, 250, and 270. Phosphorus aluminum or brass.

As described above, the fixing structure for the primary barrier reinforcing member according to an embodiment of the present invention is 1 when the reinforcing members 210, 230, 250, and 270 are installed on the primary barrier 10 without using additional fixing means. Since the primary barrier 10 can be fixed on the insulation board, there is an advantage that can simplify the time and process for installing the primary barrier 10.

In addition, the fixed structure for the reinforcement member for the primary barrier reinforcement of the liquefied natural gas storage tank according to an embodiment of the present invention, the liquefied natural gas storage installed in a self-propelled LNG carrier ship or LNG Regasification Vessel (RV) vessel In addition to tanks, it can be applied to LNG storage tanks installed in floating offshore structures such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage Regasification Units (FSRUs).

As described above, the present invention has been described through limited embodiments and drawings, but the present invention is not limited thereto, and the present invention has been described below by the person skilled in the art to which the present invention pertains. Various modifications and variations are possible within the scope of the claims.

10: primary barrier 12: first wrinkle
14: second wrinkle portion 16: intersection portion
100: first fixing member 110: first protrusion
130, 150: first extension 170: second insertion groove
300: second fixing member 310: second protrusion
330, 350: second extension

Claims (12)

A reinforcing member fixing structure for fixing a reinforcing member for reinforcing wrinkles of a primary barrier located inside a liquefied natural gas storage tank to the primary barrier,
The primary barrier includes a first wrinkle portion, a second wrinkle portion arranged in a direction perpendicular to the first wrinkle portion, and an intersection portion where the first wrinkle portion and the second wrinkle portion cross each other.
The reinforcing member fixing structure,
A first fixing member having one side inserted into one end of the first reinforcing member and the other side inserted and fixed to the lower side of the intersection to fix the first reinforcing member positioned below the first pleat;
It is formed separately from the first fixing member, one side is inserted into one end of the second reinforcing member to fix the second reinforcing member located below the second corrugated portion, the other side is inserted below the first fixing member A fixing structure for a primary barrier reinforcing member comprising a second fixing member to be fixed.
The method of claim 1,
The first fixing member,
A first protrusion inserted into and fixed to a first insertion groove formed on the lower side of the intersection portion;
And a first extension extending from said first protrusion to support said first reinforcement member.
3. The method of claim 2,
The first extension is formed in a pair,
And the pair of first extension portions are formed to extend in both lateral directions of the first protrusion.
3. The method of claim 2,
And the first protrusion may be shape-fitted to the first insertion groove.
5. The method according to any one of claims 2 to 4,
And the first extension part is inserted into one end of the first reinforcing member to support the first reinforcing member.
The method of claim 5, wherein
The second fixing member,
A second protrusion inserted into and fixed to a second insertion groove formed on a lower surface of the first protrusion;
And a second extension extending from said second protrusion to support said second reinforcement member.
The method according to claim 6,
The second extension portion is formed in a pair,
The pair of second extension portions are fixed to the primary barrier reinforcement member, characterized in that formed to extend in both lateral directions of the second protrusion.
The method according to claim 6,
The second protrusion is fixed structure for the primary barrier reinforcement member, characterized in that the shape can be coupled to the second insertion groove.
The method according to claim 6,
And the second extension part is inserted into one end of the second reinforcement member to support the second reinforcement member.
The method according to claim 6,
And the first extension portion and the second extension portion each have a plate shape corresponding to an inner shape of the first reinforcement member and the second reinforcement member.
The method according to claim 6,
And the first fixing member and the second fixing member are made of a metal plate.
The method according to claim 6,
The first and second extensions are liquefied, characterized in that the first and second protrusions are formed obliquely so as to be inclined upward toward each end side of the first and second extensions, respectively. Fixed structure for primary barrier reinforcement member of natural gas storage tank.

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