KR20100089160A - Fixing device for insulation panel of cryogenic liquid storage tank and method for construction of the insulation panel using the same - Google Patents

Abstract

PURPOSE: A fixing device for an insulation panel of a cryogenic liquid storage tank and a construction method of an insulation panel using the same are provided to independently control the steps of an insulation panel without using a step control pad. CONSTITUTION: A fixing device(13) for an insulation panel of a cryogenic liquid storage tank comprises a fastener(33) and a connecting member(32). The connecting member is coupled to a lower pad(15). The fastener fixes the connecting member to a stud bolt(14). A receiving groove(28) is formed in a protective plate(21) of the lower pad. The connecting member is slidably coupled to the receiving groove.

Description

FIXING DEVICE FOR INSULATION PANEL OF CRYOGENIC LIQUID STORAGE TANK AND METHOD FOR CONSTRUCTION OF THE INSULATION PANEL USING THE SAME}

The present invention relates to a cryogenic liquid storage tank, and more particularly, to an insulation panel fixing device for cryogenic liquid storage tank for coupling an insulation panel for insulating a storage space where cryogenic liquid is stored to a stud bolt fixed to a tank wall. And it relates to a construction method of the insulation panel using the same.

Cryogenic liquids, such as LNG, Liquid Argon (LAR), Liquid Nitrogen (LIN), Liquid Oxygen (LOX), and Liquid Hydrogen (LH2), are stored in insulated storage tanks to minimize liquid loss by evaporation. Stored or transported in stored condition.

As an example of such a cryogenic liquid storage tank, the storage tank for liquefied natural gas is for storing the cryogenic liquefied natural gas of about -165 ℃, there are spherical type (Spherical Type) and membrane type (Membrane Type). Membrane type liquefied natural gas storage tank is the most widely used because of its larger loading capacity and simpler manufacturing than the spherical type liquefied natural gas storage tank. Membrane-type liquefied natural gas storage tanks include Mark-III and NO-96 types developed by Gaz Transport et Technigaz (GTT). Among them, the Mark-III type is preferred to the NO-96 type because of its simple construction and low material cost.

The liquefied natural gas storage tank of the Mark-III type includes a primary barrier having a surface directly in contact with the cryogenic liquefied natural gas, and an insulation panel coupled to the rear surface of the primary barrier. The insulation panel has a sandwich structure including a top pad coupled to the primary barrier and a bottom pad fixed to the tank wall. The upper pad and the lower pad are each composed of a plywood protective plate and insulation such as urethane foam.

The insulation panel is fixed to the tank wall by means of stud bolts welded to the tank wall. After the insulation panel is placed on the tank wall so that the stud bolt is inserted into the connection portion of the insulation panel, the nut is screwed to the stud bolt to press the insulation panel toward the tank wall so that the insulation panel is fixed to the tank wall. After the insulation panel is fixed to the tank wall, the joint portion where the insulation panel and the stud bolt are coupled is filled with a connector made of insulation material.

When fixing the insulation panel to the tank wall, a level pad is used to match the macro step between the insulation panels. A step adjustment pad is disposed between the tank wall and the insulation panel to support the insulation panel. Since it is difficult to match the steps between the insulation panels only by supporting the step control pads, the step between the heat insulation panels is matched by compressing the step adjustment pads by rotating the nut after coupling the heat insulation panels to the stud bolts.

However, when using the step adjustment pad, when the construction of the liquefied natural gas storage tank must be accompanied by a separate position display and attachment work for attaching it, the construction time becomes longer.

In addition, if the stiffness of the step adjustment pad is small, when adjusting or loosening the nut in the vicinity to adjust the step of a specific position in one insulation panel, the step adjustment pad located in the periphery may deform the difficulty of step adjustment. have. On the contrary, if the stiffness of the step adjustment pad is large, breakage may occur at the coupling portion of the stud bolt and the insulation pad due to excessive pressure generated during step adjustment.

The present invention is to solve the above problems, it is possible to adjust the step between the insulating pads without using the conventional step control pad to shorten the construction time, independent of the position of the combination of each stud bolt and the insulating pad It is an object of the present invention to provide a fixing device for a thermal insulation panel of a cryogenic liquid storage tank and a method of constructing the thermal insulation panel using the same, which is capable of adjusting a step and stably fixing the thermal insulation panel to the tank wall.

In one embodiment of the present invention for achieving the above object, the fixing device for the insulating panel of the cryogenic liquid storage tank includes a fastening mechanism screwed to the stud bolt and a connecting member coupled to the fastening mechanism. The fastening mechanism connects a first head, a second head spaced apart from the first head, the first head and the second head, and is wider than the first head and the second head. It includes a small torso. The connection member is coupled to the insulation panel so as to protrude from the outer surface of the insulation panel, a portion of which is coupled to the fastening mechanism by being inserted into a gap between the first head and the second head.

Here, the connection member may have a fixing groove into which the body portion can be inserted.

In addition, only one of the first head, the second head, and the body may have a screw thread so as to be screwed to the stud bolt.

In addition, the body portion may be formed in a circular hollow pipe shape.

In addition, the fixing device for the insulating panel of the cryogenic liquid storage tank according to an embodiment of the present invention is disposed between at least one of the first head and the connecting member and between the second head and the connecting member. It may further include a washer.

In addition, the fixing device for the insulation panel of the cryogenic liquid storage tank according to an embodiment of the present invention may further include an elastic member coupled to the stud bolt to be disposed between the tank wall and the first head.

In addition, the connection member may be coupled to a receiving groove formed in the insulation panel to extend inward from the outer surface of the insulation panel.

Method of constructing a heat insulation panel according to an embodiment of the present invention for achieving the above object, the step of coupling the connection member to protrude to the outer surface of the heat insulation panel, the portion of the connection member is inserted into the stud bolt Screwing a fastener sphere having a clearance therebetween, and inserting a portion of the connection member into the gap of the fastening mechanism to couple the connection member to the fastening mechanism.

The construction method of the insulation panel according to an embodiment of the present invention may further include adjusting the height of the connection member by rotating the coupling mechanism after coupling the connection member to the coupling mechanism.

In addition, the construction method of the insulating panel according to an embodiment of the present invention, after coupling the connecting member to the fastening mechanism, the method may further include inserting a washer between the connecting member and the fastening mechanism.

In addition, the construction method of the insulating panel according to an embodiment of the present invention, before coupling the fastening mechanism to the stud bolt, the elastic member for adjusting the coupling height of the fastening mechanism of the tank wall and the fastening mechanism The method may further include coupling to the stud bolt to be disposed therebetween.

According to the present invention, since the step of the heat insulation panel can be adjusted by rotating the fastening mechanism screwed to the stud bolt, the working time can be shortened as compared with using a conventional step adjusting pad.

In addition, the present invention is capable of independent step adjustment at each joining position of the stud bolt and the insulation panel, thereby preventing distortion of the insulation panel and local deformation, and actively responding to manufacturing tolerances of the insulation panel and the tank wall. Can cope

In addition, the present invention can stably fix the heat insulation panel to the tank wall.

Hereinafter, with reference to the accompanying drawings will be described for the fixing device for the insulation panel of the cryogenic liquid storage tank according to an embodiment of the present invention and the construction method of the insulation panel using the same. In the drawings, the size and shape of the components, etc. may be exaggerated or simplified to aid in understanding the invention.

1 and 2 schematically show a liquefied natural gas storage tank for ships as an example of the cryogenic liquid storage tank. 1 and 2, the storage tank for liquefied natural gas, the tank wall 10 to form a storage space for storing the liquefied natural gas, the tank wall 10 to insulate the liquefied natural gas storage space Insulation panel 11 coupled to one side of the insulation, primary barrier 12 coupled to the insulation panel 11 to be in direct contact with the liquefied natural gas, insulation panel for fixing the insulation panel 11 to the tank wall 10 And a fixing device (13). A plurality of stud bolts 14 are fixed to one surface of the tank wall 10.

The insulation panel 11 is disposed between the tank wall 10 and the primary barrier 12 to insulate the liquefied natural gas storage space. The insulation panel 11 includes a lower pad 15 fixed to the tank wall 10 and an upper pad 16 stacked on the lower pad 15 and coupled to an inner surface of the primary barrier 12. Between the upper pads 16, the upper middle pads 17 to fill the space between the upper pads 16 is coupled. These lower pads 15, upper pads 16, and upper middle pads 17 each have protection plates 21, 23 and 25 made of a material having a high compressive strength, such as plywood, and heat insulation such as polyurethane foam. Insulation materials 22, 24 and 26 are made. The heat insulation panel 11 is fixed to the tank wall 10 by the stud bolts 14 fixed to the tank wall 10, and the plurality of heat insulation panels 11 are disposed to be adjacent to each other to cover the tank wall 10. The primary barrier 12 is a part directly contacting the liquefied natural gas and is made of a metal material such as stainless steel having a corrugation part 27 to reduce in-plane rigidity during thermal contraction and expansion.

As shown in FIGS. 1 and 2, the fixing device 13 for the insulation panel is fastened to fix the connection member 32 and the connection member 32 coupled to the lower pad 15 to the stud bolts 14. Mechanism 33. The protection plate 21 of the lower pad 15 is provided with a receiving groove 28 extending inward from the outer surface, the connecting member 32 is slidably coupled to the receiving groove 28. Receiving groove 28 has a width that is equal to or slightly larger than the width of the connecting member 32, the length is made of a length that can accommodate most of the connecting member (32).

As shown in FIG. 3, the receiving groove 28 is composed of a deep groove 28a open to the outer surface of the connecting member 32 and a shallow groove 28b extending inwardly from the end of the deep groove 28a. . The depth of the shallow groove 28b is greater than or equal to the thickness of the connecting member 32, and the depth of the deep groove 28a is deeper than the depth of the shallow groove 28b. A locking jaw 29 is provided at a portion where the deep groove 28a ends, that is, a portion where the deep groove 28a and the shallow groove 28b meet. The locking jaw 29 is caused by the difference between the depths of the deep grooves 28a and the shallow grooves 28b. When the part of the connection member 32 protrudes from the outer surface of the lower pad 15, the connection member 32 Is prevented from being pushed back into the receiving groove 28 again. In addition, the protection plate 21 of the lower pad 15 is formed with a plurality of insertion grooves 30 into which the rivet 34 for fixing the connection member 32 is inserted.

As shown in FIGS. 3 and 4, the connecting member 32 has a flat shape so that the connecting member 32 can be inserted into the receiving groove 28 of the lower pad 15, and a pair of long grooves into which the rivet 34 is inserted. 37 has a fixing groove 39 to which the stud bolt 14 is coupled. The fixing groove 39 is formed at the center of one end of the connecting member 32, and the pair of long grooves 37 are spaced apart from each other and formed in parallel with the longitudinal direction of the receiving groove 28.

The long groove 37 has a narrow groove 37a through which the tail 35 of the rivet 34 for coupling the connecting member 32 to the lower pad 15 and the head 36 of the rivet 34 are formed. It consists of a two-stage structure of the wide groove 37b located. The narrow groove 37a and the wide groove 37b overlap vertically, and the rivet 34 is inserted in the narrow groove 37a direction in the wide groove 37b. The tail portion 35 of the rivet 34 inserted into the narrow groove 37a is inserted into the insertion groove 30 of the lower pad 15, and the head 36 of the rivet 34 is the narrow groove 37a. It does not pass through and contacts the step part 38 between the narrow groove 37a and the wide groove 37b. The wide groove 37b is deeper than the thickness of the head 36 so that the head 36 of the rivet 34 is completely received and does not protrude out of the connecting member 32.

As shown in FIG. 3, the connecting member 32 is inserted into the receiving groove 28 of the lower pad 15 to be stored or transported in a state where it is hardly protruded. This is because when the connecting member 32 protrudes from the outer surface of the lower pad 15, it is inconvenient to store or transport the lower pad 15. When the connecting member 32 is accommodated in the receiving groove 28, the end of the connecting member 32 positioned inside the receiving groove 28 is located in the shallow groove 28b and is inserted through the long groove 37. The rivet 34 inserted into the groove 30 supports the connecting member 32 so as not to be separated from the lower pad 15. The connecting member 32 may be made of a metal, a composite material, a polymer, or a mixed material thereof.

As shown in FIG. 5, when coupling the lower pad 15 to the stud bolt 14, the connecting member 32 protrudes from the outer surface of the lower pad 15. At this time, when the rivet 34 is further inserted into the insertion groove 30, the connecting member 32 is in close contact with the lower pad 15 and is unable to move so as to protrude from the outer surface of the lower pad 15. In the present invention, the plurality of rivets 34 are coupled to the lower pad 15 to be changed to a bolt-nut structure or other coupling means for supporting the connection member 32 from being separated from the receiving groove 28. Can be.

As shown in FIGS. 6 and 7, the fastening mechanism 33 includes the first head 41, the second head 42, the first head 41 and the second head 42. It includes a body portion 43 for connecting. The body portion 43 is formed in the shape of a hollow pipe having a circular cross section. The body portion 43 is a portion inserted into the fixing groove 39 of the connecting member 32, the height of which is equal to or greater than the thickness of the connecting member (32). The width of the body portion 43 is smaller than the width of the first head portion 41 and the second head portion 42, so that the width of the first head portion 41 and the second head portion 42 around the body portion 43 is reduced. Between the gap 44 is formed a portion of the connecting member 32 can be inserted.

When the height of the body portion 43 is equal to the thickness of the connecting member 32, when the body portion 43 is inserted into the fixing groove 39 of the connecting member 32, the connecting member 32 around the fixing groove 39 A portion is pressed into the gap 44 between the first head 41 and the second head 42. At this time, either one of the first head 41 or the second head 42 supports one surface of the connection member 32, and the other one presses the other surface of the connection member 32, thereby connecting the connection member ( 32 may be tightly coupled to the fastener sphere 33.

The first head 41 and the second head 42 is made in the form of a nut as shown, and integrally coupled to the body portion 43 through various methods, such as welding, interference fit, bonding using an adhesive do. Alternatively, the first head 41, the second head 42 and the body 43 may be integrally manufactured without the need for assembly. The first head 41, the second head 42, and the body 43 may be made of various materials such as metal or various high strength polymer materials.

Here, the shape of the nut only refers to the external shape of the first head 41 and the second head 42, and the thread is formed inside each of the first head 41 and the second head 42. It does not mean that it is provided. That is, both the first head 41 and the second head 42 may have a thread so that they can be screwed to the stud bolt 14, the first head 41 and the second head 42 Thread may be provided only in any one of The first head 41 and the second head 42 may be changed to a shape other than the hexagon nut shape as shown. Body portion 43 has an inner diameter larger than the outer diameter of the stud bolt 14 so that interference does not occur when the fastening mechanism 33 is coupled to the stud bolt (14).

As an embodiment to be modified, the fastening mechanism 33 may have threads of both the first head 41, the second head 42 and the body 43. In addition, the fastening mechanism 33 has only one of the first head part 41, the second head part 42 and the body part 43, or the first head part 41 and the second head part ( 42) and the thread portion may be provided in any two parts of the body portion (43).

As shown in FIGS. 8 and 9, when the fastening mechanism 33 is coupled to the connecting member 32, a first washer 45 is disposed between the connecting member 32 and the first head 41. The second washer 46 may be interposed between the connecting member 32 and the second head 42. When the first washer 45 and the second washer 46 are used, when the height of the body portion 43 of the fastening mechanism 33 is greater than the thickness of the connecting member 32, the connecting member 32 is moved to the first head portion. It can press-fit firmly in the clearance 44 between 41 and the 2nd head part 42. As shown in FIG. The first washer 45 and the second washer 46 may be previously attached to the first head 41 and the second head 42, respectively, before the fastening mechanism 33 is coupled to the connecting member 32. After the fastening mechanism 33 is coupled to the connecting member 32, the connecting member 32 is interposed between the first head 41 and between the connecting member 32 and the second head 42, respectively. Can be.

Alternatively, in view of ease of operation, the first washer 45 is integral with the first head 41, and the second washer 46 is in the form of an open washer 47, as shown in FIG. 10. After the coupling mechanism 33 is coupled to the connecting member 32, the second head 42 and the connecting member 32 may be interposed. In this case, even if the stud bolt 14 is slightly inclined, a space in which the second washer 46 may be interposed may be secured, and work flexibility may be improved by using the second washers 46 having various thicknesses. As shown, the width of the first washer 45 is greater than the width of the first head 41 and the width of the second washer 46 is greater than the width of the second head 42, so that the first washer 45 and the second washer 46 serves to increase the contact area between the fastening mechanism 33 and the connecting member 32 to increase the coupling force therebetween.

When fixing the heat insulation panel 11 to the tank wall 10 by using the heat insulation panel fixing device 13 according to an embodiment of the present invention, first, the fastening mechanism 33 to the stud bolts 14. Screw in. At this time, by rotating the fastening mechanism 33 can determine the height of the connection member 32 is located. When the connection member 32 protruding from the outer surface of the lower pad 15 is coupled to the fastening mechanism 33 coupled to the stud bolt 14, the heat insulation panel 11 is coupled to the tank wall 10. When the fastening mechanism 33 coupled to the connection member 32 is rotated, the height of the heat insulation panel 11 can be adjusted, and the step with the neighboring heat insulation panel 11 can be adjusted.

On the other hand, as shown in Figure 11, before coupling the fastening mechanism 33 to the stud bolt 14, if the elastic member 48 having an arbitrary thickness in advance to the fastening mechanism 33, the fastening mechanism 33 ) Makes it easier to set the reference height. Here, as the elastic member 48, a spring or a spring washer made of metal, polymer, wood, or the like may be used. The thickness of the elastic member 48 may be set to a thickness corresponding to the deformation amount of the tank wall 10. The elastic member 48 may increase the coupling stability of the heat insulation panel 11 by supporting the fastening mechanism 33.

According to the present invention, by connecting the coupling member 32 mounted on the lower pad 15 to the fastening mechanism 33 coupled to the stud bolt 14 so that height adjustment is possible, the heat insulation panel 11 is connected to the tank wall ( 10) can be fixed stably. And it is possible to adjust the step of the heat insulating panel 11 by rotating the fastening mechanism 33 without using the step control pad as in the prior art. Therefore, it is possible to omit additional work for installing the step adjustment pad can improve the productivity. In addition, since the independent step adjustment is possible in each stud bolt 14, it is possible to actively cope with the local deformation or distortion of the insulation panel 11, manufacturing tolerances.

In the above description, the storage tank of liquefied natural gas for ships has been described as an example, but the present invention may be applied to various cryogenic liquid storage tanks installed on a ship or on the ground.

The present invention described above is not limited to the configuration and operation as shown and described. That is, the present invention is capable of various changes and modifications within the spirit and scope of the appended claims.

1 is a side cross-sectional view showing a state in which an insulating panel of a liquefied natural gas storage tank is fixed to a tank wall by using the fixing device for the insulating panel according to an embodiment of the present invention.

2 is a plan view showing a state in which the insulation panel of the liquefied natural gas storage tank is fixed to the tank wall by using the fixing device for the insulation panel in one embodiment of the present invention.

Figure 3 is a side cross-sectional view showing a state in which the connection member of the fixing device for insulation panel according to an embodiment of the present invention is coupled to the lower pad of the insulation panel.

Figure 4 is a perspective view showing a connection member of the fixing device for a heat insulation panel according to an embodiment of the present invention.

Figure 5 is a side cross-sectional view showing a state in which the connection member of the fixing device for a heat insulation panel according to an embodiment of the present invention protruded to the outer surface of the lower pad of the heat insulation panel.

6 and 7 are a side view and a plan view showing a fastening mechanism of the fixing device for a heat insulation panel according to an embodiment of the present invention.

8 and 9 are a side view and a plan view showing a state in which the connection member is fixed to the stud bolt by using the fastening mechanism of the fixing device for insulating panels according to an embodiment of the present invention.

10 is a plan view showing an open washer that can be used as a second washer of the fixing device for the insulation panel according to an embodiment of the present invention.

11 is a side view showing a state in which the fastening mechanism of the fixing device for the insulation panel according to an embodiment of the present invention is coupled to the stud bolt to which the support member is coupled.

<Explanation of symbols for the main parts of the drawings>

10 tank wall 11 insulation panel

12: primary barrier 13: fixing device

14: stud bolt 15: lower pad

16: upper pad 17: upper middle pad

28: receiving groove 32: connecting member

33: fastening mechanism 34: rivet

37: long groove 39: fixed groove

41, 42: first and second head 43: body

44: gap 45, 46: first and second washers

48: elastic member

Claims (11)

In the cryogenic liquid storage tank fixing device for coupling the insulation panel to the stud bolt fixed to the tank wall, A first head, a second head spaced from the first head, a first head and the second head, and a body portion having a smaller width than the first head and the second head; A fastening mechanism screwed to the stud bolt; And a connection member coupled to the insulation panel to protrude from an outer surface of the insulation panel, the portion of which is coupled to the fastening mechanism by being inserted into a gap between the first head and the second head. Fixture for insulation panels of cryogenic liquid storage tanks. The method of claim 1, The connecting member is fixed to the insulating panel of the cryogenic liquid storage tank, characterized in that the body has a fixing groove into which the insert can be inserted. The method of claim 1, Clamping device for a thermal insulation panel of the cryogenic liquid storage tank, characterized in that it has a screw thread so that any one of the first head, the second head and the body can be screwed to the stud bolt. The method of claim 1, The body portion fixing device for the insulation panel of the cryogenic liquid storage tank, characterized in that the circular hollow pipe shape. The method of claim 1, And a washer disposed between at least one of the first head and the connection member and between the second head and the connection member. The method of claim 1, And a resilient member coupled to the stud bolt so as to be disposed between the tank wall and the first head. The method of claim 1, The connecting member is fixed to the insulation panel of the cryogenic liquid storage tank, characterized in that coupled to the receiving groove formed in the insulation panel to extend inward from the outer surface of the insulation panel. In the construction method of the insulation panel for coupling the insulation panel of the cryogenic liquid storage tank to the stud bolt fixed to the tank wall, Coupling a connection member to the insulation panel to protrude to an outer surface of the insulation panel; Screwing a fastening mechanism having a gap into which the portion of the connection member can be inserted into the stud bolt; And inserting a portion of the connection member into the gap of the fastening mechanism to couple the connection member to the fastening mechanism. The method of claim 8, And after the coupling member is coupled to the fastening mechanism, adjusting the height of the connection member by rotating the fastening mechanism. The method of claim 9, And after inserting the connecting member into the fastening mechanism, inserting a washer between the connecting member and the fastening mechanism. The method of claim 8, Before coupling the fastening mechanism to the stud bolt, further comprising coupling an elastic member for adjusting the engagement height of the fastening mechanism to the stud bolt so as to be disposed between the tank wall and the fastening mechanism. Construction method of the insulation panel, characterized in that.

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