KR20200026557A - Insulation structure of membrane type strorage tank - Google Patents

Abstract

Disclosed is an insulation structure for a membrane type storage tank. The insulation structure for a membrane type storage tank, which allows a second insulation panel, a second sealing wall, a first insulation panel and a first sealing wall to be sequentially stacked toward the inside of the storage tank from an inner wall of a hull, improves a shape of a groove formed on a lower portion of the first insulation panel so as to receive a corrugated part and an intersection part uplifted toward the inside of the storage tank on a metal membrane of the second sealing wall, thereby improving insulation performance of the insulation panel and alleviating stress concentration on the lower portion of the insulation panel.

Description

Insulation structure of membrane type storage tank {INSULATION STRUCTURE OF MEMBRANE TYPE STRORAGE TANK}

The present invention relates to an insulating structure of a membrane-type storage tank having an intersection portion formed at an intersection of transverse and longitudinal corrugations formed in the metal membrane, and an accommodating groove accommodating the pleats and intersection portions of the metal membrane. will be.

Generally, liquefied natural gas storage tanks are for storing or transporting cryogenic liquefied natural gas (LNG) at about -163 ° C. In order to safely store cryogenic liquefied natural gas, a sealing wall made of a metal membrane is sealed. It consists of an insulating panel surrounding the wall.

Since the metal membrane is in direct contact with the liquefied natural gas in the cryogenic state, it is made of a metal material resistant to low temperature brittleness to cope with the stress change, and has a structure that can expand and contract with repeated temperature changes and load changes of the liquefied natural gas. The edges of the neighboring metal membranes are welded to each other by overlap welding to maintain the airtightness of the storage tank.

The heat shrink occurs by the cryogenic liquefied natural gas, and there is a risk that the welded part is damaged due to the thermal stress when the heat shrink occurs.

To prevent this, the metal membrane is formed with a plurality of corrugations arranged in the longitudinal and transverse directions. Wrinkles reduce the thermal stress by deforming a certain amount during heat shrinkage of the metal membrane. A knot is formed at the site where the longitudinal wrinkles and the horizontal wrinkles are orthogonal to prevent stress concentration.

On the other hand, when the LNG storage tank is transported by a vehicle such as a ship, swelling may occur on the surface of the LNG stored by the movement such as rolling, pitching, etc. of the vessel generated during transportation. Can be.

This slump is called sloshing, which applies a great compressive force to the metal membrane. When the compressive force by sloshing exceeds the yield strength of the metal membrane, the stability of the metal membrane may be deteriorated while permanent deformation occurs at the pleats and intersections most susceptible to deformation.

Therefore, the metal membrane must maintain a low surface stiffness in response to heat shrinkage and at the same time have a high pressure resistance performance in response to the compressive force caused by sloshing.

However, in the conventional metal membrane, the heights of the intersecting portions are formed differently so that the transverse and longitudinal corrugations cross each other, and the asymmetrical shape causes a difference in the stiffness of the transverse corrugations and the longitudinal corrugations.

The face stiffness of the metal membrane is largely dependent on the stiffness of the intersection rather than the shape of the corrugation itself. Conventional metal membranes have a risk of collapse due to heat shrinkage or sloshing pressure due to the asymmetrical shape at the intersection.

In addition, in the case of the primary sealing wall disposed at the innermost side of the storage tank, the interference between the corrugated portion and the intersection portion formed in the metal membrane and the insulating panel does not occur, but in the case of the secondary sealing wall, the primary insulating panel and the secondary Since it is disposed between the insulation panels, interference may occur between the wrinkles and intersections formed in the metal membrane and the insulation panels.

In order to prevent such interference, grooves are formed in the insulation panel to accommodate wrinkles and intersections, and as the height of the intersection increases, the grooved area of the insulation panel increases to affect the insulation performance of the storage tank. Go crazy.

The technical problem to be achieved by the present invention is to provide a thermal insulation structure of the membrane-type storage tank having a high durability in response to the compression force due to heat shrinkage and sloshing occurring in the cryogenic state by newly improving the cross-sectional shape of the metal membrane.

In addition, the present invention is to minimize the groove area of the insulation panel by reducing the height of the intersection of the metal membrane, to improve the shape of the groove formed in the insulation panel to accommodate the wrinkles and intersection of the metal membrane to insulate the storage tank We want to improve performance.

In order to achieve the above object, the present invention provides a membrane-type storage tank in which the secondary insulation panel, the secondary sealing wall, the primary insulation panel, and the primary sealing wall are sequentially stacked from the inner wall of the hull toward the inside of the storage tank. In the thermal insulation structure, a metal membrane formed in a transverse direction and a longitudinal direction and includes a corrugated portion which is raised toward the inside of the storage tank and an intersection formed at a portion where the corrugated portions formed in the transverse and longitudinal directions cross each other. The secondary sealing wall made of; And a primary heat insulation panel provided as a unit block and a plurality of primary heat insulation panels are arranged on an upper side of the secondary sealing wall, wherein the primary heat insulation panel comprises: a heat insulating material made of polyurethane foam (PUF); A lower protective plate made of plywood and bonded to the lower surface of the heat insulating material; A first groove formed along a circumference of the lower protection plate at a lower portion of the primary insulation panel; And a second groove formed at the lower edge of the primary insulation panel to penetrate the lower protection plate so that the insulation is exposed. Each of the first grooves provided at a lower portion of the primary insulation panel adjacent to each other is provided. The corrugated portion is accommodated in an opposing space, and the intersection is accommodated in a space where the second grooves are provided at the lower edges of the four primary insulating panels adjacent to each other, and the first groove has an angle. While being provided in the form of a bent groove, the second groove is provided in the form of a groove having a fan-shaped cross section, provides an insulating structure of the membrane-type storage tank.

The first groove may include a first inclined surface and a second inclined surface formed by cutting out a lower circumference of the lower protective plate, and the second inclined surface may be formed to be bent at an obtuse angle with respect to the first inclined surface. .

The second groove may be provided in the form of a fan with a central angle of 90 °.

The second groove may be provided in a form in which a part of the exposed edge of the heat insulating material is cut out obliquely toward the edge from the inside of the heat insulating material.

The cross section, the cross portion is raised upward in the form of a cross; A connection part provided at each point where the end of the cross part and the wrinkle part are connected; And a depression recessed downward from an upper surface of the connection part.

The depression is formed in a one-letter shape, the depression formed in the connecting portion in contact with the pleats extending in the lateral direction, the contact with the pleats extending in the longitudinal direction, to have a longitudinal direction in the longitudinal direction The recessed portion formed in the connecting portion may be formed to have a longitudinal direction in the transverse direction.

The connection part may be provided in a spherical shape having a circle or ellipse in cross section, and the width of the connection part may be wider than that of the wrinkle part.

The cross portion may have a narrower width than the wrinkle portion.

The present invention can maximize the elasticity at the intersection of the wrinkles by the shape of the improved intersection. Therefore, the present invention has the effect of reducing the surface rigidity of the metal membrane while reducing the width and height of the corrugated portion of the metal membrane and the height of the intersection portion as compared with the prior art.

In addition, the present invention can be produced in a symmetrical shape having the same width and height as the transverse wrinkle portion and the longitudinal wrinkle portion. Since the transverse and longitudinal corrugations having symmetrical shapes have the same face stiffness, the risk that the metal membrane collapses by heat shrinkage or sloshing pressure is significantly reduced.

In addition, since the transverse folds and the longitudinal folds are manufactured in a symmetrical shape, it is possible to reduce defects and reduce processing costs that may occur in the stiffness difference between the lateral folds and the longitudinal folds.

In addition, the present invention reduces the height of the cross section to minimize the grooved area of the insulation panel, improve the shape of the groove for accommodating the pleats and the cross section to alleviate the concentration of stress in the lower portion of the insulation panel and improve the thermal insulation performance It is effective to let.

1 is a view showing a unit metal membrane included in a membrane type storage tank according to the present invention.
FIG. 2 is an enlarged view of the intersection formed in the metal membrane of FIG. 1.
(A) of FIG. 3 shows the top view and side view of the intersection part of FIG. 2, (b) shows the modified example of (a).
Figure 4 is a diagram showing the thermal stress analysis results by modeling, (a) is a thermal stress analysis results for a conventional metal membrane, (b) is a thermal stress analysis results for a metal membrane according to the present invention.
FIG. 5 is a view of the lower portion of the insulation panel on which the grooves of the angular shape are formed.
6 is a view showing a state in which an intersection is accommodated in an angled groove.
7 (a) is a view for explaining that the intersection of the metal membrane is accommodated in the heat insulation panel of FIG. 5, (b) is a view for explaining that the wrinkle portion of the metal membrane is accommodated in the heat insulation panel of FIG. .
FIG. 8 is a view of the lower part of the insulating panel in which grooves of the improved form are formed according to the present invention.
9 is a view showing a state where the intersection is accommodated in the groove of the improved form according to the present invention.
10 (a) is a view for explaining that the intersection of the metal membrane is accommodated in the heat insulation panel of FIG. 8, (b) is a view for explaining that the wrinkle portion of the metal membrane is accommodated in the heat insulation panel of FIG. .
11 shows a unit insulation panel in which grooves of an improved form are formed according to the present invention, (a) is a sectional view seen from the side, and (b) is a view seen from below.
12 is a view showing a thermal stress analysis results by modeling, (a) is a thermal stress analysis results for the insulation panel is formed with the groove of the angular shape, (b) is a groove of the improved shape according to the present invention is formed Thermal stress analysis results for insulation panels.

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

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

1 is a view showing a unit metal membrane included in a membrane-type storage tank according to the present invention, Figure 2 is an enlarged view showing the intersection formed in the metal membrane of FIG.

1 and 2, the metal membrane 100 according to an embodiment of the present invention, the lateral wrinkle portion 120 formed in the transverse direction on the metal sheet 110, the longitudinal direction formed in the longitudinal direction The wrinkle portion 130, and the intersection portion 140 formed at a portion where the lateral wrinkle portion 120 and the longitudinal wrinkle portion 130 intersect.

The transverse folds 120 and the longitudinal folds 130 may be provided to have a cross section of a substantially half arc shape in the form of an upwardly raised shape.

The cross section 140 may be formed at an intersection where the transverse pleats 120 and the longitudinal pleats 130 are perpendicular to each other, and the cross section 141 and the cross section 141 are formed at the center. It may include a connection portion 142 is formed in the connection portion to which the parts 120 and 130 are connected.

The cross 141 crosses the bent portions having the same traveling direction as the transverse crease 120 and the longitudinal crease 130, respectively, and are raised upward in a cross shape.

The connection part 142 is provided at each end of the cross part 141, and connects the wrinkle parts 120 and 130 and the cross part 141.

The connection part 142 may be formed in a substantially spherical shape, such as droplets rounded by surface tension, and may have a flat cross section of a circle or ellipse when viewed from above.

The connection part 142 may include a recessed part 143 recessed downward. Contrary to the connecting portion 142 raised upward from the metal sheet 110, the recessed portion 143 is formed to be recessed downward from the upper surface of the connecting portion 142.

The depression 143 is recessed to induce stretching during thermal contraction by the cryogenic liquefied natural gas, and serves to facilitate the stretching in the transverse and longitudinal directions at the intersections of the corrugations 120 and 130. Do it.

The depression 143 formed on the upper surface of the connection portion 142 may be formed in a one-piece shape, the depression 143 of the connection portion 142 that meets the transverse wrinkle portion 120 is in the longitudinal direction In order to have the longitudinal direction, the recessed portion 143 of the connecting portion 142 which meets the longitudinal pleats 120 may be formed to have a longitudinal direction in the transverse direction. That is, the one-shaped depression 143 formed in the connecting portion 142 may be formed in a direction perpendicular to the traveling direction of the pleats 120 and 130 where the corresponding connecting portion 142 meets.

On the other hand, in the present invention, the cross section 140 is raised slightly higher than the wrinkles 120 and 130 as a whole. Specifically, it is preferable that the height of the upper end of the cross section 141 is raised by approximately 1.7 to 1.9 times the height of the pleats 120 and 130, and the cross section 141 is provided to be inclined downward from the top end to the end.

In addition, the width of the cross portion 141 may be formed narrower than the width of the wrinkles (120, 130). According to this, the width of the wrinkles 120 and 130 that progressed to a predetermined width meets the connecting portion 142 and then expands to the cross section 141, and then the width decreases drastically. Elasticity at the intersection of 120 and 130 is improved.

In this case, the elasticity at the intersection may be further maximized by the depression 143 formed on the upper surface of the connection part 142.

As described above, the present invention can significantly reduce the surface stiffness of the metal membrane 100 by the improved shape of the cross section 140, so that the width and height of the corrugations (120, 130) and the cross section The height of the 140 can be greatly reduced as compared with the prior art.

(A) of FIG. 3 shows the top view and side view of the intersection part of FIG. 2, (b) shows the modified example of (a). FIG. 3A is as described above, and the intersection portion 140 shown in FIG. 3B is a modified embodiment in which the upper central region of the cross portion 141 is recessed.

According to (b) of FIG. 3, the cross portion 141 protrudes upward as a whole, but the upper central region is recessed downward so that the cross portion 141 may be provided as a crater.

When the upper central region of the cross section 141 is configured to be recessed, the elasticity at the cross section 140 can be further maximized, and as the top height of the cross section 140 is reduced, the cross section 140 is reduced. It is possible to reduce the grooving area of the insulation panel to interfere with.

Figure 4 is a diagram showing the thermal stress analysis results by modeling, (a) is a thermal stress analysis results for a conventional metal membrane, (b) is a thermal stress analysis results for a metal membrane according to the present invention.

Referring to Figure 4 compares the thermal stress analysis results of the metal membrane 100 and the conventional metal membrane according to the present invention. Reference is made to Table 1, which lists the numerical values actually applied to the metal membrane 100 and the conventional metal membrane according to the present invention.

In Table 1, the present invention (1) shows a case where the metal membrane shown in (a) of Figs. 1 to 3, and the present invention (2) is applied to the metal membrane shown in (b) of Fig. 3. .

Crease width Wrinkle height Intersection height Heat shrinkage stress Conventional 58 mm 20 mm 34.33 mm 155.6 Mpa Invention (1) 40 mm 12 mm 21.7 mm 102.5 Mpa Invention (2) 40 mm 12 mm 20.5 mm 104.2 Mpa

Referring to the numerical values set forth in [Table 1], the metal membrane 100 according to the present invention can significantly lower the heat shrinkage stress while reducing the width and height of the corrugation portion and the height of the cross section 140 than the conventional metal membrane. It can be confirmed.

Conventional metal membranes are typically fabricated with a height of about 20 mm or more in order to reduce surface stiffness, which is greatly reduced in the present invention. In the present invention, the fact that the height of the wrinkles 120 and 130 can be greatly reduced may be referred to as an effect due to the shape of the intersection 141.

On the other hand, the membrane-type storage tank of the present invention has a configuration in which the secondary insulation panel, the secondary sealing wall, the primary insulation panel, the primary sealing wall sequentially stacked from the inner wall of the hull toward the inner side of the storage tank.

The primary sealing wall and the secondary sealing wall may be formed by connecting a plurality of units of the metal membrane 100 described above, and the primary insulating panel and the secondary insulating panel are formed on the upper and lower surfaces of the insulating material made of high density polyurethane foam (PUF). It may be provided in the form of bonding plywood (plywood) to.

In the present invention, the pleats 120 and 130 formed on the metal membrane 100 may be raised toward the inside of the storage tank. At this time, in the case of the primary sealing wall disposed on the innermost side of the storage tank, there is no problem that the corrugation part and the intersection part interfere with the insulation panel, but the corrugation parts 120 and 130 and the intersecting part ( 140 generates interference with the primary insulation panel 200.

In order to prevent such interference, the groove 230 accommodating the pleats 120 and 130 and the crossing portion 140 formed in the metal membrane 100 of the secondary sealing wall at the lower portion of the primary insulation panel 200. Is formed.

FIG. 5 is a view of the lower portion of the insulation panel having an angular groove formed from below, and FIG. 6 is a view illustrating a state where an intersection is accommodated in an angular groove, and FIG. 7 (a) is an insulation panel of FIG. 5. Is a view for explaining that the intersection of the metal membrane is accommodated, (b) is a view for explaining that the wrinkle portion of the metal membrane is accommodated in the insulating panel of FIG. FIG. 7B illustrates a cross section along A-A in FIG. 7A.

First, referring to FIG. 5 to FIG. 7, the configuration in which the groove 230 formed in the lower portion of the primary insulation panel 200 is formed in an angular shape will be described.

The primary insulation panel 200 may include an insulation 210 made of high density polyurethane foam, and an upper protection plate and a lower protection plate 220 made of plywood and bonded to upper and lower surfaces of the insulation 210.

In the present invention, the primary insulation panel 200 may be provided as a block of units, and a plurality of primary insulation panels 200 may be arranged. The grooves 230 may be formed at portions in which the unit blocks of the primary insulation panel 200 face each other.

The groove 230 may include a first groove 231 accommodating the pleats 120 and 130 and a second groove 232 accommodating the intersection 140.

The first groove 231 may be formed by cutting out the lower circumference of the primary insulation panel 200, and each of the primary insulation panels may be disposed below the portions where the neighboring primary insulation panels 200 face each other. A space in which the pleats 120 and 130 are accommodated is formed by the first groove 231 formed at the bottom of the 200.

The second groove 232 may be formed by cutting the lower edge of the primary insulation panel 200 wider and deeper than the first groove 231, and the four primary insulation panels 200 adjacent to each other are collected. At the lower side of the portion, a space is formed in which the intersections 140 are accommodated by the second grooves 232 formed at the lower edges of the respective primary insulation panels 200.

The first groove 231 may be formed in a shape in which the lower circumference of the lower protection plate 220 is cut out to a predetermined depth, and the second groove 232 is formed over the lower protection plate 220 and the heat insulating material 210. Can be. That is, the second groove 232 may be formed to penetrate the lower protection plate 220 to expose the heat insulating material 210.

In FIGS. 5 to 7, the first groove 231 and the second groove 232 are cut out at right angles. According to the shape, the first groove 231 and the pleats 120 and 130 are illustrated. An unnecessary surplus space may be generated between the second groove 232 and the intersection 140, and heat loss may occur.

In order to compensate for this, the present invention proposes an insulating structure of a membrane-type storage tank to improve the shape of the groove 230 to improve the insulating performance.

FIG. 8 is a view of the lower part of the insulation panel in which the grooves of the improved shape are formed according to the present invention, viewed from below, and FIG. (A) is a view for explaining that the intersection of the metal membrane is accommodated in the heat insulation panel of Figure 8, (b) is a view for explaining that the wrinkle portion of the metal membrane is accommodated in the heat insulation panel of FIG. (B) of FIG. 10 shows A-A cross section in (a) of FIG. 11 shows a unit insulation panel in which grooves of an improved form are formed according to the present invention, (a) is a sectional view seen from the side, and (b) is a view seen from below.

8 to 11 may be said to improve the shape of the first groove 231 and the second groove 232 while having a basic configuration together with the embodiment shown in FIGS. 5 to 7. .

Unlike the first groove 231 formed in a right angle shape in the previous embodiment, the first groove 231 may be formed in a groove shape cut out to have an angle.

Specifically, the first groove 231 is formed by cutting out the lower circumference of the lower protection plate 220 and includes a first inclined surface S1 and a second inclined surface S2 having a predetermined inclination, and the second inclined surface S2. ) May be bent to have an obtuse angle with respect to the first inclined surface S1.

When the second inclined surface S2 bent downward from the first inclined surface S1 has an angle greater than the first inclined surface S1 with respect to the bottom surface, the first groove 213 is bent at an obtuse angle. You can arrange.

In the present embodiment, the first groove 231 is described as having two inclined surfaces for the convenience of fabrication. The surplus space may be further reduced.

In addition, in the previous embodiment, unlike the second groove 232 having a rectangular shape, the second groove 232 may be cut out to have a circular cross section.

Here, the circle shape means that the space provided by the second groove 232 formed under the four primary insulation panels 200 adjacent to each other is formed in a circle shape. To this end, the second grooves 232 formed under each of the primary insulation panels 200 may be cut out to have a sector-shaped cross section having a central angle of 90 °.

In addition, the second groove 232 may further cut out a portion of the edge of the exposed heat insulating material 210 to accommodate the protruding shape of the intersection portion 140. Since the crossing part 140 has a form inclined downward from the top end toward the wrinkle parts 120 and 130, it is to incline a part of the corner of the heat insulating material 210 that may interfere with the cross part 140.

11 illustrates a corner portion of the unit block of the primary insulation panel 200. Referring to FIG. 11, the second groove 232 is a shape in which the lower protective plate 220 is cut out in a fan shape to expose the heat insulating material 210. In this case, the heat insulating material of the portion indicated by a in FIG. 210 is provided flat, and the heat insulating material 210 of the portion indicated by b may be cut out inclined gradually from the inside of the heat insulating material 210 toward the edge portion.

Therefore, a conical space may be formed in a portion where four adjacent primary insulation panels 200 are gathered, and the space is intended to accommodate the protruding upper end of the intersection portion 140.

As described above, according to the present invention in which the shape of the groove 230 is improved, between the groove 230 and the pleats 120, 130, and the intersection 140 formed on the lower portion of the primary insulation panel 200. By minimizing unnecessary surplus space, the thermal insulation performance of the storage tank can be improved.

12 is a view showing a thermal stress analysis results by modeling, (a) is a thermal stress analysis results for the insulation panel is formed with the groove of the angular shape, (b) is a groove of the improved shape according to the present invention is formed Thermal stress analysis results for insulation panels.

Referring to FIG. 12, it can be seen that in the (b) embodiment rather than the (a) embodiment, the stress in the region of the intersection portion 140 is significantly reduced. Therefore, the heat insulation panel 200 in which the groove of the improved form is formed according to the present invention has the effect of not only improving the heat insulation performance of the storage tank, but also preventing the concentration of stress in the lower portion of the heat insulation panel 200.

The present invention can maximize the elasticity at the intersection of the wrinkles (120, 130) by the shape of the improved intersection portion 140. Therefore, the present invention has the effect of reducing the surface rigidity of the metal membrane 100 while reducing the width and height of the corrugations 120 and 130 and the height of the cross section 140 of the metal membrane 100 as compared with the prior art. .

In addition, the present invention can be manufactured in a symmetrical shape in which the transverse wrinkle portion 120 and the longitudinal wrinkle portion 130 has the same width and height. Since the lateral folds 120 and the longitudinal folds 130 having the symmetrical shape have the same surface stiffness, the risk of the metal membrane 100 being collapsed by heat shrinkage or sloshing pressure is significantly reduced.

In addition, since the lateral wrinkles 120 and the longitudinal wrinkles 130 are manufactured in a symmetrical shape, the pleats differ in the stiffness of the lateral wrinkles 120 and the longitudinal wrinkles 130. It can reduce the defects that can occur and reduce the processing cost.

In addition, the present invention minimizes the grooved area of the insulation panel 200 by reducing the height of the cross section 140, and the shape of the groove 230 for accommodating the pleats 120 and 130 and the cross section 140. By reducing the stress concentration in the lower portion of the heat insulation panel 200 has an effect to improve the heat insulating performance.

The present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

100: metal membrane 110: metal sheet
120: horizontal wrinkle portion 130: longitudinal wrinkle portion
140: intersection 141: cross
142: connection portion 143: depression
200: primary insulation panel 210: insulation
220: lower protective plate 230: groove
231: first groove 232: second groove

Claims (8)

In the insulation structure of the membrane-type storage tank in which the secondary insulation panel, the secondary sealing wall, the primary insulation panel, the primary sealing wall is sequentially stacked from the inner wall of the hull toward the inner side of the storage tank,
The secondary formed of a metal membrane including cross portions formed in a transverse direction and a longitudinal direction and having a corrugated portion raised toward an inner side of the storage tank and a cross portion formed at a portion where the corrugated portions formed in the transverse direction and the longitudinal direction cross each other; Sealing wall; And
It includes a; primary insulating panel is provided as a unit block is arranged a plurality on the upper side of the secondary sealing wall;
The primary insulation panel,
A heat insulating material made of polyurethane foam (PUF);
A lower protective plate made of plywood and bonded to the lower surface of the heat insulating material;
A first groove formed along a circumference of the lower protection plate at a lower portion of the primary insulation panel; And
And a second groove formed at the lower edge of the primary insulation panel to penetrate the lower protection plate to expose the insulation.
The wrinkles are accommodated in a space facing each of the first grooves provided below each of the primary insulation panels adjacent to each other.
Wherein the intersection is accommodated in a space facing the second groove provided in the lower corner of the four primary insulating panels adjacent to each other,
The first groove is provided in the form of a groove bent at an angle,
The second groove is characterized in that it is provided in the form of a groove having a cross section of the fan shape,
Insulation structure of membrane type storage tank. The method according to claim 1,
The first groove,
Including a first inclined surface and a second inclined surface formed by cutting out the lower periphery of the lower protective plate,
The second inclined surface is characterized in that it is formed to be bent at an obtuse angle with respect to the first inclined surface,
Insulation structure of membrane type storage tank. The method according to claim 2,
The second groove is characterized in that the central angle is provided in a fan shape of 90 °,
Insulation structure of membrane type storage tank. The method according to claim 3,
The second groove is characterized in that the exposed part of the edge of the insulating material is provided in the form cut out obliquely toward the edge portion from the inside of the heat insulating material,
Insulation structure of membrane type storage tank. The method according to claim 4,
The intersection is,
A crisscross that is raised upward in the form of a cross;
A connection part provided at each point where the end of the cross part and the wrinkle part are connected; And
Includes; recessed portion recessed downward from the upper surface of the connection portion
Insulation structure of membrane type storage tank. The method according to claim 5,
The depression is formed in the form of one (1),
The depression formed in the connection portion in contact with the corrugation portion running in the longitudinal direction has a longitudinal direction in such a manner that the depression formed in the connection portion in contact with the corrugation portion running in the lateral direction has a longitudinal direction. Formed to have,
Insulation structure of membrane type storage tank. The method according to claim 6,
The connecting portion is provided in the shape of a sphere having a circle or ellipse in cross section,
The width of the connecting portion is characterized in that wider than the wrinkles,
Insulation structure of membrane type storage tank. The method according to claim 7,
Width of the cross portion is characterized in that narrower than the wrinkles,
Insulation structure of membrane type storage tank.

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