JP2008240808A - Heat insulation layer construction method for low temperature tank wall surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation layer construction method for a low temperature tank wall surface capable of attaining outstanding increase of working efficiency by reduction of working labor and improvement in ease of work and constructing a heat insulation layer with sufficient finishing. <P>SOLUTION: A die frame 17 made of wood having thickness equal to heat insulation layer finishing thickness is detachably mounted to a steel liner surface 4 portion corresponding to a lower part of a urethane pouring space 12 by a urethane pouring device 16 of a field foaming type heat insulation layer construction facility A through a magnet 18, and a predetermined heat insulation layer 7 is automatically mechanically constructed at the steel liner surface 4 portion above the die frame 17 made of wood through the field foaming type heat insulation layer construction facility A. Thereafter, the die frame 17 made of wood is removed from the steel liner surface 4, and the lower heat insulation layer having the same thickness as the upper heat insulation layer 7 is continuously constructed on the lower steel liner surface 4 portion including the removal portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a rigid urethane foam (hereinafter referred to as an outer wall of a low temperature tank for storing a low temperature liquefied gas such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG)) or a wall such as an inner surface of an outer wall of an inner / outer double wall. The present invention also relates to a method for constructing a heat insulation layer on a wall surface of a low-temperature tank in which a heat insulation layer is formed by on-site construction.

  When forming a thermal insulation layer of hard urethane on the wall of a low-temperature tank, it is hard for surface reinforcement, surface protection and appearance finishing to prevent harmful cracks due to low temperature thermal shock and temperature stress due to temperature gradient and its progress. In general, a heat insulating layer is formed by attaching a surface material such as a glass mesh to the surface of urethane to integrate the both.

  When constructing a heat insulating layer (hereinafter referred to as an integral PUF) in which such a hard urethane and a surface material are integrated in the field, the wall surface is conventionally mounted on a lifting body that is suspended up and down along the wall surface of a low temperature tank. A pressing face plate capable of forming an injection space corresponding to the finished thickness of the predetermined heat insulating layer, and a surface material supply capable of sequentially feeding the surface material to the surface side of the injection space in synchronization with the upward movement of the pressing face plate Using an in-situ foam insulation layer construction facility equipped with a device and a urethane injection device for injecting and foaming a urethane stock solution into the injection space, an integrated PUF in which a rigid urethane foam and a surface material are integrally formed on the wall surface is mechanically A method for automatic construction has already been developed and put into practical use (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 3656011 JP 2002-284288 A

  By the way, in the heat insulation layer construction method using the on-site foaming type heat insulation layer construction equipment as shown in the above-mentioned patent documents 1 and 2, the arrangement relationship of each component of the on-site foaming type heat insulation layer construction equipment and the low temperature tank to be constructed Due to the bottom structure, etc., the integrated PUF cannot be mechanically automatically applied to the lowest part of the wall surface to be constructed, and the wall portion below the ground height of about 1.4 to 1.8 m is separately sprayed. The method of artificially post-installing is adopted. Therefore, when an automatic PUF of the wall surface part above the above range at the ground height is mechanically automatically constructed by the in-situ foam insulation layer construction equipment, it is injected into the wall part corresponding to the lower part of the urethane injection space of the construction equipment. It is necessary to set up a formwork to catch the urethane stock solution. As the formwork, a molded PUF board with the same specifications as an integrated PUF that is mechanically automatically constructed is prepared. A means of using the adhesive by adhering it to the wall surface with an adhesive has been adopted.

  However, in the case of such a molded PUF board pasting means, it takes time to prepare the molded PUF board for delivery to the construction site, marking the wall surface pasting position, masking, etc. before the pasting. Since a curing period of one day or longer is required until the adhesive is cured after the molded PUF board is pasted, workability and work efficiency are very poor. Also, if there is unevenness on the wall surface of the molded PUF board and it is not flat, there will be gaps on the bonding surface, and it will not be possible to paste it firmly, so repair such as filling the gap with adhesive is also necessary. Therefore, workability is even worse. Furthermore, when a part of the PUF protrudes from the molded PUF mold during construction of the integrated PUF, it is difficult to remove the protruding PUF, and the molded PUF mold or the integrated PUF is easily damaged by using a belt sander or the like. In addition, when the molded PUF board is brought into the construction site or attached to the wall surface, it is easy to break or break corners. As a result, there is a problem that the heat insulation layer finish after construction is not good.

  The present invention has been made in view of the above circumstances, and it is possible to significantly increase work efficiency by reducing the number of work steps and improving workability, and at a low temperature capable of constructing a heat-insulating layer having a good finish. It aims at providing the thermal insulation layer construction method of a tank wall surface.

In order to achieve the above-mentioned object, the heat insulation layer construction method for a low-temperature tank wall according to the present invention forms a heat-insulation layer between the wall surface and a lifting body that is suspended up and down along the wall surface of the low-temperature tank. A pressing surface plate capable of forming an injection space for the injection, a surface material feeding device capable of sequentially feeding a surface material to the surface of the injection space in synchronism with the upward movement of the pressing surface plate, and a urethane undiluted solution is injected and foamed into the injection space. Using the in-situ foam heat insulation layer construction equipment equipped with a urethane injection device, a heat insulation layer construction method for a low temperature tank wall surface, which constructs a heat insulation layer in which a rigid urethane foam and a surface material are integrally formed on the wall surface,
A wooden mold having a thickness equal to the finished thickness of the heat insulation layer is detachably attached to the wall surface corresponding to the lower portion of the injection space by the action of a magnet, and the wall is formed on the wall surface above the wooden mold. After the upper heat insulation layer is constructed by the foaming heat insulation layer construction facility, the wooden formwork is removed from the wall surface, and the lower heat insulation layer is constructed on the lower wall surface portion in continuation with the upper heat insulation layer.

  Here, as the magnet, a magnet that is integrated and held within the wall thickness of the wooden mold (Claim 2) or a magnet that is removably attached to the wooden mold by a magnetic force (Claim). Any of item 3) may be used.

  According to the present invention having the above-described features, it is sufficient to simply mark the wall surface portion corresponding to the lower portion of the urethane injection space by the urethane injection device and attach the wooden formwork by the action of the magnet. The time required for preparation before sticking and the number of work steps required in the case of sticking molds with various adhesives can be reduced, and workability is greatly improved by eliminating the adhesive curing period and the removal of protruding urethane. Thus, a significant increase in work efficiency can be achieved as a whole. In addition, even if there are some irregularities on the wall surface, it can be securely and securely attached to the wall surface corresponding to the irregularities by the magnetic force of the magnet without the need for repairs and the like, and a molded PUF formwork is used The formwork can be diverted without fear of breakage or corner loss as in the case, and the seam strength between the upper heat insulation layer that is mechanically automatically applied and the lower heat insulation layer that is applied later The effect that it can hold | maintain high and can finish the heat insulation layer over a wall surface full length with sufficient finishing is acquired.

  In particular, when the wooden formwork is separated from the magnet and the magnet and the wooden formwork are detachable, it is possible to change the number and arrangement of the magnets according to the situation such as the unevenness of the wall surface, The mold can be more stably attached to the wall surface, and the wooden mold can be removed more easily after the upper heat insulating layer is constructed.

  Moreover, in the heat insulation layer construction method of the low-temperature tank wall surface which concerns on this invention, it is preferable that the soft cushioning material is affixed on the said wooden formwork at least on the back surface, ie, the steel liner surface side (Claim 4). . In this case, if there is unevenness on the wall surface of the formwork, the unevenness can be absorbed by deformation of the soft cushioning material itself, and the formwork can be securely attached to the wall surface without gaps and with the magnetic force of the magnet. be able to.

  Furthermore, in the heat insulation layer construction method for a low-temperature tank wall according to the present invention, the wooden mold is provided with a release paper for detaching the wooden mold from the wall after the construction of the upper heat insulation layer. It is preferable to use (Claim 5). In this case, the mold can be easily removed from the wall surface and the upper heat insulation layer with the release paper after the upper heat insulation layer is constructed, and it moves to the adjacent construction position on the same construction site without taking any troubles such as repairing. Alternatively, it can be transported to another construction site and used repeatedly.

  Furthermore, in the thermal tank construction method for a low-temperature tank wall according to the present invention, it is desirable that the upper surface of the wooden form is formed on a slope that becomes lower as it is closer to the wall. In this case, it is possible to increase the seam adhesion area between the upper heat insulating layer to be preliminarily applied and the lower heat insulating layer to be subsequently applied, and to further increase the joint bonding strength between the upper heat insulating layer and the lower heat insulating layer. In addition, in the construction of the lower heat insulating layer, it is possible to prevent the occurrence of air accumulation between the lower part of the upper heat insulating layer in foaming of the urethane stock solution.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
1 and 2 show the schematic configuration of the on-site foam-type heat insulation layer construction equipment used in the implementation of the heat-insulation layer construction method for the low-temperature tank wall according to the present invention and the state of automatic insulation construction using the on-site foam-type heat insulation layer construction equipment. It is the side view and front view which show an outline. When this in-situ foam-type heat insulation layer construction facility A is used, as shown in FIG. 3, the prestressed concrete (PC In the annular space 3 between the outer tank 2 and the outer tank (outer wall) 2 constructed from the above, the thermal resistance reducing material can be mechanically automatically applied to the steel liner surface 4 on the inner surface of the outer tank 2. The thermal resistance mitigating material is a heat insulating layer in which a rigid urethane foam (hereinafter referred to as PUF) 5 and a glass mesh 6 as an example of a surface material that covers and reinforces and protects the surface of the PUF 5 are integrally molded by in-situ foaming of urethane. (Upper heat insulating layer) 7.

  The in-situ foam-type heat insulation layer construction facility A is attached to a trolley beam (not shown) installed at the top between the inner and outer tubs 1 and 2 and extends along the steel liner surface 4 serving as a heat insulation construction target wall surface in the space 3. And a gondola-like lifting body 8 that is suspended so as to be freely raised and lowered. The elevating body 8 includes a rectangular pressing surface plate 9 capable of forming an injection space 12 for forming a predetermined heat insulating layer 7 between the steel liner surface 4 and the upward movement of the pressing surface plate 9. A glass mesh feeding device 13 capable of feeding the glass mesh 6 to the holding face plate 9 side of the injection space 12 together with the release paper and the glass mesh as the surface material so as to be on the inner side of the injection space 12 through the guide roller 10; It comprises a urethane injection head 14 which is arranged above the elevating body 8 and injects a urethane stock solution between the feeding glass mesh 6 and the steel liner surface 4 and a traverser 15 which reciprocates the urethane injection head 14 in the horizontal and lateral directions. The urethane injecting device 16 and the releasable face material 22 that is wound and held in a roll shape are passed through the sliding contact guide plate 23 during the construction of the heat insulating layer 7 and the above-mentioned urethane. Emissions injection space 12 Te sequentially feeding toward the one open end portion of and a said open ended portion to close releasability surface material supply device 24.

  4 to 6 illustrate the structure of the mold 17 attached to the steel liner surface 4 corresponding to the lowermost part of the upper heat insulating layer 7 automatically constructed by the in-situ foam heat insulating layer construction facility A. FIG. This formwork 17 has a wall thickness t equal to the finished thickness of the upper heat insulating layer 7 and the width of the upper heat insulating layer 7 in the unit area that is automatically constructed by one uplift movement of the on-site foam heat insulating layer construction equipment A. A wooden formwork having an equal width w. Within the thickness of the wooden formwork 17, a block-shaped magnet 18 with ON / OFF that can be attached to and detached from the steel liner surface 4 is integrally incorporated and held at an appropriate interval in the width w direction. In addition, a soft cushioning material 19 such as a soft urethane foam is attached to the back surface of the wooden formwork 17 that contacts the steel liner and the opposite surface. The wooden mold 17 can be fixed to the steel liner surface 4 by turning on the block-shaped magnet 18 and can be easily removed by turning it off. Further, the upper surface 17a of the wooden mold 17 is formed on a slope that becomes lower as the steel liner surface 4 is closer to the steel liner surface 4 in the attached state.

  Next, the construction procedure for constructing the heat insulation layer 7 on the upper portion of the steel liner surface 4 using the above-described field foam heat insulation layer construction equipment A and the wooden mold 17 with the magnet 18 will be described.

  First, as shown in FIG. 7A, the wooden formwork 17 is attached to the wooden formwork 17 by winding a release paper 20 so as to cover the soft cushioning material 19 and the inclined surface 17a on the front and back sides. 7 (B), the magnetic liner 18 is attached to a predetermined portion of the steel liner surface 4 marked in advance.

  In this state, while ascending and moving the lifting body 8 of the in-situ foam-type heat insulation layer construction facility A along the steel liner surface 4 above the attachment position of the wooden mold 17, as shown in FIG. The glass mesh 6 with release paper is sequentially fed from the glass mesh feeding device 13 to the pressing face plate 9 side of the urethane pouring space 12 and at the same time, the urethane pouring space between the feeding glass mesh 6 and the steel liner surface 4 is passed through the traverser 15. Then, as shown in FIG. 7C, a predetermined thickness in which the PUF 5 and the glass mesh 6 are integrally formed by injecting and foaming a urethane stock solution from the injection head 14 of the urethane injection device 16 that reciprocates horizontally and horizontally. The heat insulation layer (upper heat insulation layer) 7 in the unit construction area having a width t and a width w is mechanically automatically applied.

  After that, the wooden formwork 17 separately prepared in the same procedure as shown in FIGS. 7A and 7B is attached to the steel liner surface 4 of the unit construction area adjacent to the heat insulating layer 7 in the lateral direction. At the same time, the in-situ foam-type heat insulation layer construction equipment A is transferred and set, and the heat insulation layer (upper heat insulation layer) 7 in the unit construction area is mechanically automatically applied in the same manner as described above. By repeatedly applying the heat insulating layer 7 in such a unit construction area over the entire surface of the steel liner surface 4 a plurality of times, the upper heat insulating layer 7 covering the entire area of the steel liner surface 4 is applied.

  Then, after the construction of the upper heat insulating layer 7 over the entire area of the steel liner surface 4 is completed, the wooden formwork 17 with the magnet 18 is removed from the steel liner surface 4 as shown in FIG. Since the release paper is attached to the wooden frame 17, the wooden frame member 17 can be easily removed from the upper heat insulating layer 7. The release paper 20 can be peeled off from the upper heat insulating layer 7 at the same time as the wooden mold 17 depending on its release performance, or can be easily peeled off by hand after the wooden mold 7 is removed by lightly adhering to the upper heat insulating layer 7. It is. As shown in FIG. 7E, glass is applied to the surface of the PUF 5a by manually spraying urethane onto the lower steel liner surface 4 including the removed part of the wooden formwork 7 at the lower part of the upper heat insulating layer. The lower heat insulating layer 7a to which the mesh 6a is affixed is applied in a state of being integrally joined to the upper heat insulating layer 7 through the joint portion 11 formed by the slope 17a of the wooden mold 17. The lower heat insulating layer 7a preferably has the same thickness t as the upper heat insulating layer 7 in terms of appearance.

  As described above, the wooden mold 17 with the magnet 18 is used as a mold to be used by attaching to the steel liner surface 4 corresponding to the lower part of the urethane injection space 12 by the urethane injection device 16 of the in-situ foam insulation layer construction facility A. Thus, it is possible to attach the mold 17 to a predetermined position via the magnet 18 simply by marking on the steel liner surface 4, which is necessary in the case of the pasting mold using an adhesive. The time required for preparation before attaching, the number of work steps can be reduced, the adhesive curing period is unnecessary, and the removal work of the protruding urethane can be performed after removing the formwork 17, so that the workability is greatly improved. As a result, overall work efficiency can be significantly improved. In addition, even if there are some irregularities on the steel liner surface 4, it is necessary to attach the steel liner surface 4 firmly and securely in accordance with the irregularities by the magnetic force of the magnet 18 and the cushioning material 19 without the need for repairs. As is the case with a molded PUF formwork, it is possible to prevent breakage of the formwork or breakage of the corners. Further, after the upper heat insulating layer 7 is applied, the formwork 17 is separated. It can be easily removed from the steel liner surface 4 and the upper heat insulating layer 7 by the pattern paper 20, and moved to an adjacent construction position on the same construction site without being troubled for repair, or transported to another construction site for repeated use. It is possible.

  In addition, it is possible to increase the seam bonding area between the upper heat insulating layer 7 mechanically automatically applied and the lower heat insulating layer 7a to be subsequently applied through the inclined surface 17a of the mold 17, and the joint joint strength is increased. The heat insulation layer which consists of the upper heat insulation layer 7 and the lower heat insulation layer 7a which hold | maintain and is formed over the full length of the steel liner surface 4 can be constructed with the finishing of a junction part.

  Incidentally, the results of comparing the construction method of the present invention using the wooden formwork 17 with the magnet 18 and the conventional construction method using the molded PUF board are collectively shown in Table 1.

  In the above embodiment, as the wooden formwork 17, the one in which the magnet 18 is integrated and held within the wall thickness is used. However, as shown in FIGS. A separate type may be used. That is, the upper surface is a slope 17a, soft cushioning material 19 is attached to both the front and back surfaces, and automatic construction is performed by the thickness t equal to the finished thickness of the upper heat insulation layer 7 and the on-site foam heat insulation layer construction equipment A. A magnetic plate, such as an iron plate, which has a wooden frame 17 having a width w equal to the horizontal width of the upper heat insulating layer 7 of the unit area and a magnet 18 and is fixed to the lower surface of the wooden frame 17 with an adhesive, screws or the like. An arbitrary number of magnets 18 are detachably attached to 21 via magnetic force. In this case, there are two types of magnets 18: an ON / OFF-attached block magnet that can be attached to and detached from the magnetic plate 20 disposed on the wooden mold 17, and an ON / OFF-attached block magnet that can be attached to and removed from the steel liner. It is good also as a structure provided with detachable to both the magnetic board 20 and the steel liner which were arrange | positioned in the wooden formwork 17 with the block magnet with 1 type of ON / OFF.

  When such a separate type wooden formwork 17 is used, not only the handling becomes easy due to the weight reduction, but also the number and arrangement of the magnets 18 are changed according to the unevenness of the steel liner surface 4 and the like. It is possible to attach the wooden mold 17 to the steel liner surface 4 more stably, and it becomes possible to use a short release paper 20 as the release paper 20, and the mold 17 after the upper heat insulating layer 7 is constructed can be used. The removal work can be performed more easily, and the overall work efficiency can be further improved.

  Moreover, although the case where the lower heat insulation layer 7a was constructed by manually spraying urethane or the like has been described in the above embodiment, automatic construction may be performed using dedicated construction equipment.

It is a side view which shows the general | schematic structure of the on-site foaming type heat insulation layer construction equipment used for implementation of the heat insulation layer construction method of the low-temperature tank wall surface concerning this invention, and the outline | summary of the automatic heat insulation construction condition by it. It is a front view of FIG. It is an expansion vertical side view of the principal part explaining a heat insulation construction location. It is an enlarged side view which shows the formwork structure attached to the wall surface (steel liner surface) corresponded to the lowest part of the upper heat insulation layer by an on-site foaming type heat insulation layer construction equipment. FIG. 5 is a front view of FIG. 4. FIG. 5 is a bottom view of FIG. 4. (A)-(E) are the expansion side views of the principal part explaining the construction condition of a heat insulation layer in order of construction. It is an enlarged side view which shows the other example of the formwork structure attached to the wall surface (steel liner surface) corresponded to the lowest part of the upper heat insulation layer by an on-site foaming type heat insulation layer construction equipment. It is a front view of FIG. It is a bottom view of FIG.

Explanation of symbols

4 Steel liner surface (wall surface)
5 PUF (rigid urethane foam)
6 Glass mesh (surface material)
7 Upper heat insulation layer 7a Lower heat insulation layer 8 Lifting body 9 Holding surface 12 Urethane injection space 13 Glass mesh feeding device (surface material feeding device)
16 Urethane injection device 17 Wooden formwork 17a Slope 18 Magnet 19 Soft cushioning material 20 Release paper A On-site foaming heat insulation layer construction equipment

Claims (6)

A pressing face plate capable of forming an injection space for forming a heat insulating layer between the lifting and lowering body that is suspended up and down along the wall surface of the low-temperature tank, in synchronization with the upward movement of the pressing face plate Using a surface material feeding device capable of sequentially feeding surface material on the surface of the injection space, and a urethane foaming device for injecting and foaming a urethane stock solution into the injection space, an in-situ foam thermal insulation layer construction facility is used to harden the wall surface. A heat insulation layer construction method for the wall surface of a low temperature tank in which a heat insulation layer in which urethane foam and a surface material are integrally molded is constructed,
A wooden mold having a thickness equal to the finished thickness of the heat insulation layer is detachably attached to the wall surface corresponding to the lower portion of the injection space by the action of a magnet, and the wall is formed on the wall surface above the wooden mold. After constructing the upper thermal insulation layer with the foaming thermal insulation layer construction equipment, the wooden formwork is removed from the wall surface, and the lower thermal insulation layer is constructed on the lower wall portion in tandem with the upper thermal insulation layer. Insulation layer construction method for tank walls.   The heat insulation layer construction method of the low-temperature tank wall surface of Claim 1 with which the said magnet is integrated and hold | maintained integrally in the thickness of the said wooden formwork.   The heat insulation layer construction method of the low-temperature tank wall surface of Claim 1 with which the said magnet is attached to the said wooden formwork so that it can detach | leave by magnetic force.   The heat insulation layer construction method of the low-temperature tank wall surface according to any one of claims 1 to 3, wherein a soft cushioning material is attached to at least the back surface of the wooden formwork.   The heat insulation layer on the wall surface of the low-temperature tank according to any one of claims 1 to 4, wherein the wooden formwork is provided with a release paper for removing the wooden formwork from the wall surface after the upper heat insulation layer is applied. Construction method. The heat insulation layer construction method for a low-temperature tank wall according to any one of claims 1 to 5, wherein an upper surface of the wooden formwork is formed on a slope that becomes lower as the wall is closer to the wall.

Images