JP3656011B2 - Insulating layer construction method for low temperature tank wall and its construction equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating layer made of hard urethane foam (hereinafter simply referred to as hard urethane) on the outer wall of a low temperature tank such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG), in particular, on the inner surface of the outer wall of the inner and outer double walls. The present invention relates to a heat insulation layer construction method for a low temperature tank wall surface and a heat insulation construction device for a low temperature tank wall surface used for the construction.
[0002]
[Prior art]
When forming a thermal insulation layer of hard urethane on the wall surface of a low temperature tank, surface reinforcement, surface protection and appearance finishing to prevent the generation and development of harmful cracks in the thermal insulation layer due to thermal stress due to low temperature thermal shock and temperature gradient. Therefore, it is common to employ a means for sticking a glass fiber fabric, that is, a glass mesh or the like as a surface reinforcing material on the surface of hard urethane.
[0003]
Conventionally, hard urethane is sprayed directly onto the wall surface to the required thickness when a predetermined heat insulation layer is applied to the low-temperature tank wall surface using hard urethane and a surface reinforcing material such as glass mesh attached to the surface. A foaming method was used. More specifically, as shown in FIG. 7 (A), particles directed toward the wall surface W by a blast device 31 carried by a worker M who has entered a gondola 30 that can be moved up and down along the low temperature tank wall surface W and moved horizontally. After the wall surface W is blasted, a primer is applied to the wall surface W after the polishing using a hand-painting roller 32 or the like, as shown in FIG. 7B.
[0004]
Subsequently, as shown in FIG. 7C, a hard urethane spray 33 is set on the gondola 30, and the hard urethane PUF is applied from the spray 33 to the wall surface W after the primer treatment by raising and lowering and horizontally moving the gondola 30. After blowing and foaming, the surface of the heat insulating layer 37 made of urethane PUF is cut to have a constant thickness using a special hand cutter 34 as shown in FIG. The generated dust such as cutting waste is sucked using the vacuum cleaner 35.
[0005]
Thereafter, as shown in FIG. 7E, the adhesive 40 is applied to the surface of the heat insulating layer 37 made of urethane PUF by the spray gun 36 held by the worker M on the gondola 30. 7 (F), the surface reinforcing material 38 such as a glass mesh is sequentially adhered to the surface of the heat insulating layer 37 by the cooperation of a plurality of workers M. Finally, as shown in FIG. 7G, the adhesive 40 is cured by heating from above the surface reinforcing material 38 using a dryer 39 or the like, so that the surface reinforcing material 38 is made of a heat insulating layer 37 made of urethane PUF. It is fixed and integrated on the surface.
[0006]
[Problems to be solved by the invention]
In the case of the above-described conventional method for constructing a thermal barrier layer on a low-temperature tank wall, as shown in FIGS. 7A to 7G, not only many processes are required, but most of the processes are performed by workers. In particular, the cutting of the hard urethane surface is difficult to mechanize and is a manual operation, so that there is a problem that it requires a huge number of man-hours and costs as a whole. In addition, it is inevitable that the working environment is deteriorated by dust such as mist generated when spraying hard urethane and cutting waste generated when cutting the surface of hard urethane, and in particular, heat insulation construction of the inner surface of the outer wall of the inner and outer double walls In this case, work in a closed narrow space is forced, so the work environment is significantly deteriorated due to mist and dust.
[0007]
In addition, in order to smooth the surface of the applied thermal insulation layer and finish its thickness so that there is no variation across the entire wall surface, the thickness of the thermal insulation layer from the spraying of urethane to the surface cutting process However, whether such thickness accuracy is good or bad depends on the experience and skill level of field workers, and there is a limit to improving the thickness accuracy. In addition, in order to insulate the entire area of a tank wall that is very large in area, the wall surface is divided into a plurality of construction areas with a certain width, and hard urethane is sequentially sprayed and foamed into each of the divided unit construction areas. Although construction is performed, there is no standard for thickness, so not only does the thickness of the heat insulation layer vary in each construction area, but also the connection points between adjacent heat insulation layer ends. There is a problem that a step is generated at the joint part, and unevenness or a minute gap is generated at the boundary surface, resulting in a very poor finish.
[0008]
The present invention has been made in view of the above-described circumstances, and enables integral molding with a surface reinforcing material only by in-situ foaming of hard urethane, significantly reducing construction man-hours and construction costs, and greatly improving the working environment. In addition, the amount of high-risk work such as high-end gondola work can be greatly reduced, and the thickness accuracy can be drastically improved. Moreover, it aims at providing the heat insulation layer construction method of the low-temperature tank wall surface which can construct the heat insulation layer of uniform finish, and its construction apparatus.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the method for constructing a heat insulation layer on a low-temperature tank wall according to the present invention includes a heat insulation layer comprising a hard urethane foam and a surface reinforcing material for reinforcing the surface of the hard urethane foam on the wall surface of the low-temperature tank. It is a heat insulation layer construction method for the wall surface of the low temperature tank to be constructed in the field, and a prefabricated spacer having the same thickness and the same heat insulation property as the hard urethane foam on the heat insulation construction wall surface of the low temperature tank is in parallel with each other at a predetermined interval. And after sticking linearly toward the vertical direction of the heat insulation construction wall surface, it enters between the opposing surfaces of the roller and the adjacent pair of spacers that can be pressed against the surface of the pair of adjacent spacers . while a pressing plate forming a space to travel longitudinally oriented upper end from the longitudinal bottom of the spacer of the spacer between presser of the space At the same time sequentially feeding the surface reinforcement on the side, injecting rigid polyurethane stock solution between the feed surface reinforcement and insulation construction wall, becomes equal to the thickness of the spacer by foaming the injected hard urethane stock solution A heat-insulating layer in a unit construction area in which rigid urethane foam and surface reinforcing material are integrally molded is applied between a pair of adjacent spacers so that they are sometimes cured, and then adjacent to the surface of each spacer on both sides The surface reinforcing material for joints is pasted and applied in a state where the end surface of the surface reinforcing material of the heat insulating layer in the unit construction area is overlapped.
[0010]
In addition, the low temperature tank wall heat insulation construction device according to the present invention is mounted on a gondola that is suspended up and down along the low temperature tank heat insulation wall surface in parallel with each other at a predetermined interval from the low temperature tank heat insulation wall surface. And a pressing roller that can run against a surface of a pair of pre-made spacers that have the same thickness and the same thermal insulation properties as a rigid urethane foam that has been applied in a straight line toward the vertical direction of the heat insulation wall. The presser plate that enters the space between the opposing surfaces of the pair of spacers and forms a space between the heat insulation wall and the presser of the space when the gondola moves upward from the lower end in the longitudinal direction of the spacer toward the upper end in the longitudinal direction of the spacer Surface reinforcing material supply device capable of sequentially feeding surface reinforcing material to the plate side, surface reinforcing material and heat insulation construction wall surface fed from the surface reinforcing material supply device The urethane injection head and traverser injecting rigid polyurethane stock is equipped between the same and the thickness rigid polyurethane stock solution to be injected is foaming of the spacer between the surface reinforcing member and the heat insulation construction wall from the urethane injection head The foaming characteristics of the above hard urethane stock solution, the injection amount from the urethane injection head, the pressing load of the pressing plate, the area of the pressing plate, and the lifting travel speed of the pressing plate are set so as to be cured when It is what.
[0011]
According to the heat insulation construction method of the low-temperature tank wall of the present invention, while pressing the roller against the surface of the spacer that is preliminarily parallel to the heat insulation construction wall surface of the low-temperature tank and linearly pasted in the vertical direction of the wall surface, While the presser plate is inserted between the opposing surfaces of the adjacent spacers, the roller and presser plate are moved upward from the lower end in the longitudinal direction of the spacer toward the upper end through the gondola, and continuously between the presser plate and the wall surface. Adjacent spacers are formed by a series of processes in which the surface reinforcing material is sequentially fed to the presser plate side of the space formed at the same time, and at the same time, a hard urethane stock solution is injected into the space between the drawn surface reinforcing material and the wall surface and foamed. It is possible to construct a heat insulation layer in a unit construction area in which a hard urethane and a surface reinforcing material are integrally formed therebetween. In this way, by continuous integral molding of injection molding of hard urethane and pasting of surface reinforcing material to the surface of hard urethane, the use of a special adhesive to bond them and the application work of adhesive are unnecessary, and construction Man-hours and construction costs can be reduced. In addition, there is no need to cut hard urethane surfaces, and there is no dust generated during cutting, as well as injection foaming of urethane stock solution, and there is no mist generation as seen with conventional spray foaming. The environment can be greatly improved.
[0012]
In addition, since the spacer attached in advance to the wall surface has the same thickness as the rigid urethane foam to be constructed by injection foaming, the presser plate presser is based on the thickness of the spacer attached in advance. Special experience and high level of skill are required by controlling the load and area, the amount of undiluted solution injected in consideration of the foaming characteristics of rigid urethane, the ascending running speed of construction equipment, etc., and visually controlling the state of foam injection. At least, it is possible to greatly improve the thickness accuracy of the heat insulating layer made of the rigid urethane foam and the surface reinforcing material. Furthermore, the spacer affixed to the wall surface exerts a damming function that prevents liquid or gel urethane injected into the unit construction area formed between a pair of adjacent spacers from flowing out to the adjacent construction area. As a result, it is possible to prevent variation in the thickness between the heat insulation layers of the unit construction area formed by foaming under a predetermined stock solution injection amount, and the spacer itself is the end of the heat insulation layer of the unit construction area. It is possible to construct a heat insulating layer having a uniform thickness with a smooth surface that is free of steps and uneven thickness over the entire wall surface.
[0013]
The spacer used in the method for constructing the heat insulation layer on the wall surface of the low-temperature tank according to the present invention is not limited as long as it has a heat insulation characteristic equivalent to that of hard urethane foam, and particularly with a hard urethane foam formed by injection foaming in the field. By using what was produced from the same urethane material, the heat insulation layer which has a uniform heat insulation effect and intensity | strength over the whole wall surface can be formed.
[0014]
In addition, the surface reinforcing material in the unit heat insulating layer used in the above-described thermal insulation method for the wall surface of the low-temperature tank and the surface reinforcing material for joints applied to the spacer surface have excellent resistance to thermal shock and thermal stress. Thus, it is preferable to use a glass mesh that can greatly reduce the occurrence of damage such as cracks in the heat insulating layer. In particular, injection of urethane stock solution by using non-adhesive or difficult-to-adhesive release paper affixed to urethane on the surface side of the glass mesh used as the surface reinforcing material in the heat insulating layer of the unit construction area While preventing leakage at the time of foaming, the glass mesh with a property that makes it difficult to apply tension is sufficiently tensioned via release paper to prevent wrinkles on the surface, and the appearance is also good. While the heat insulation layer can be constructed, only the release paper can be easily peeled and removed after the construction, so that the reinforcing effect by the surface reinforcing material can be surely exhibited.
[0015]
Furthermore, in the present invention, by making the inner surface of the outer wall of the inner and outer double walls in the low temperature tank to be constructed, the workability in a narrow space between the inner and outer double walls can be significantly improved and no dust is generated. The working environment can be further improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a schematic configuration of a heat insulation construction apparatus for a low-temperature tank wall according to the present invention and an outline of a heat insulation construction situation, and FIG. 2 is a front view thereof. As shown in FIG. 3, the heat insulation construction apparatus A includes an inner tub 1 in a low temperature tank that stores LNG and the outer tub constructed from precast concrete (PC) so as to surround the outer periphery of the inner tub 1 ( Installed in the annular space 3 between the outer wall 2 and the steel liner surface 4 on the inner surface of the outer tub 2 as a thermal resistance mitigating material, covering and reinforcing the surface of the hard urethane foam (hereinafter referred to as PUF) 5 and this PUF 5 The glass mesh 6 as an example of the surface reinforcing material to be used is used to construct the heat insulating layer 7 integrally formed by in-situ foaming of urethane.
[0017]
As shown in FIGS. 1 and 2, the heat insulation construction apparatus A is attached to a trolley beam (not shown) installed at the top between the inner and outer tubs 1 and 2, and steel that is a construction target surface in the space 3. A gondola 8 suspended up and down along the liner surface 4 is provided. The gondola 8 is equipped with equipment for integrally molding the heat insulating layer 7.
[0018]
The gondola 8 is equipped with an integral molding facility that is attached to the steel liner surface 4 in parallel with each other at a predetermined equal interval L in advance and linearly in the vertical direction of the steel liner surface 4. A pair of pre-made spacers 9, 9 (details will be described later) pressed against the surface of the gondola 8 and moved up and down as the gondola 8 moves up and down. A rectangular presser plate 12 that can enter a space 11 corresponding to the finished thickness t of the PUF 5 between the opposing surfaces of the spacers 9 and 9 and between the steel liner surface 4 and a lower portion in the gondola 8. The glass mesh 6 is wound and held in a roll together with the release paper 13 affixed to the surface side of the glass mesh 6 with a slight adhesive force, and the gondola 8 is moved upward. A glass mesh supply device 15 that can be sequentially fed to the holding plate 12 side of the space 11 through the guide roller 14 and the pressing roller 10, and a release paper that is disposed on the upper portion of the gondola 8 and is fed from the glass mesh supply device 15. A urethane injection head 16 for injecting a urethane stock solution between the glass mesh 6 with 13 and the steel liner surface 4 and a traverser 17 for reciprocating the injection head 16 in the lateral direction are constituted.
[0019]
The spacer 9 is molded to the same thickness as the finished thickness t of the PUF 5 using the same hard urethane material as that of the PUF 5 that is injected and foam-molded into the steel liner surface 4. Further, the release paper 13 is slightly adhered to the surface side of the glass mesh 6 through a non-adhesive or difficult-to-adhesive adhesive with respect to urethane. Can be peeled off.
[0020]
Next, the heat insulation layer construction procedure for the steel liner surface 4 on the inner surface of the outer tub 2 in the low temperature tank using the heat insulation construction device A having the above-described configuration will be described with reference to FIGS.
(1) After removing dust, deposits, floating rust and the like on the steel liner surface 4, surface treatment is performed using sandpaper or the like as necessary.
(2) A solventless primer is applied to the steel liner surface 4 after the base treatment using a roller brush or the like.
(3) The heat insulation construction apparatus A equipped with the above-mentioned integrated molding equipment in the gondola 8 is carried into the space 3 between the inner and outer tanks 1 and 2 and assembled, and the foaming machine room, the high pressure foaming machine, the compressor, etc. are installed in the low temperature tank. Installed on the external ground surface of the tank 2.
(4) Thermal insulation is performed on the side wall portion W of the steel liner surface 4 excluding the side wall upper portion WU and the side wall lower portion / bottom corner portion WD.
(5) Insulate the sidewall upper WU and the sidewall lower / bottom corner WD.
[0021]
Among the heat insulation work performed in the order of (1) to (5) above, the feature of the heat insulation layer construction method according to the present invention is the heat insulation work of the side wall part W shown in (4). The general construction procedure is as follows.
1) Mark the steel liner surface 4 of the side wall W with a predetermined pitch width in the horizontal horizontal direction.
2) A plurality of ready-made spacers 9 are adhered in parallel to each other at a predetermined interval L using a urethane adhesive in accordance with the marking position and linearly in the vertical direction.
3) While pressing the pressing roller 10 of the heat insulation construction apparatus A against the surface of the pair of adjacent spacers 9 and 9, as shown in FIG. 1, the presser plate 12 is inserted between the opposing end surfaces of the pair of spacers 9 and 9. travel raises the gondola 8 in a state in which to form a spatial 11 the entire thermal insulation construction device a toward the upper end from the longitudinal bottom of the spacer 9, 9 between the presser plate 12 and the steel liner surface 4 Te Let Along with this traveling, as shown in FIG. 1, the glass mesh 6 with the release paper 13 wound and held in a roll shape on the glass mesh supply device 15 passes through the guide roller 14 and the pressing roller 10, and the space 11 From the head 16 which is reciprocated in the lateral direction through the traverser 17 into the space 11 between the glass mesh 6 with the release paper 13 and the steel liner surface 4 at the same time. Urethane stock solution is injected and foamed. The urethane stock solution injected into the space 11 and foamed is cured through gel-like to semi-curing, and as shown in FIGS. 1 and 5, the PUF 5 and the glass mesh on the surface thereof are disposed between a pair of adjacent spacers 9,9. 6 is applied to the unit heat-insulating layer 7A-1 having a predetermined thickness t (that is, the same thickness as the spacer 9) .
4) When the construction of the heat insulating layer 7A-1 in the unit construction area is finished, the injected urethane protruding on the surface of the spacers 9 and 9 is cut, and the heat insulating construction device A is next between a pair of adjacent spacers 9 and 9. The heat insulation layer 7A-2 in the unit construction area is constructed in the same procedure as in 3) above. By repeatedly applying the heat insulating layers 7A-1 to 7A-n in such a unit construction area over the entire surface of the steel liner surface 4, the heat insulating layer 7 extending over the entire side wall W is applied.
5) After the construction of the heat insulating layer 7, the injected urethane protruding on the surface of each spacer 9 is removed cleanly, an adhesive is applied to the surface of each spacer 9, and the glass mesh 18 for joints is pasted. The glass mesh 18 for joints overlaps not only the surface of each spacer 9, but also the end surface of the heat insulating layers 7A and 7A in the unit construction area adjacent to the left and right sides of each spacer 9, as shown in FIG. It is pasted and constructed to do.
[0022]
The side wall upper portion WU shown in the above (5) blows and foams PUF to a required thickness, attaches a glass mesh to the surface with a tucker, and sprays PUF again on the glass mesh to a predetermined thickness. The heat insulating structure has the same thickness as the heat insulating layer 7 of the portion W. Moreover, the side wall lower part / bottom part corner part WD is made to have a heat insulating structure having the same thickness as the heat insulating layer 7 of the side wall part W by spraying and foaming PUF to a required thickness and attaching a glass mesh to the surface via an adhesive. Details of the construction procedure for these heat insulation structures are omitted.
[0023]
Further, the release paper 13 slightly adhered to the surface of the glass mesh 6 when the heat insulating layer 7 of the side wall portion W is constructed is made of urethane stock solution or gel-like foamed urethane at the time of injection foaming of the urethane stock solution for forming the PUF 5. It is used to prevent external leakage and to apply sufficient tension to the glass mesh 6 that is difficult to apply tension to prevent generation of wrinkles on the surface. By peeling and removing, a predetermined reinforcing effect by the glass mesh 6 can be surely exhibited.
[0024]
【The invention's effect】
As described above, according to the present invention, while the pressing roller and the presser plate are moved up along the surface of the spacer linearly pasted in advance on the heat insulation wall surface of the low temperature tank, the feeding of the surface reinforcing material and the hard urethane are performed. By simply performing a series of steps such as injection and foaming of a stock solution, a heat insulating layer in a unit construction area in which a rigid urethane foam and a surface reinforcing material are integrally formed between adjacent spacers can be continuously applied. Therefore, the use of a special adhesive for bonding the rigid urethane foam and the surface reinforcing material and the operation of applying the adhesive are unnecessary, and the number of construction steps and the construction cost can be greatly reduced. In particular, cutting work on the surface of rigid urethane foam is unnecessary, and not only dust is not generated due to cutting, but also injection foaming of urethane stock solution that does not generate mist is sufficient, so the work environment can be greatly improved. it can.
[0025]
In addition, the injection amount and construction of the undiluted solution taking into consideration the presser load and area of the presser plate and the foaming characteristics of the hard urethane, based on the thickness of the rigid urethane foam molded by injection foaming, with the spacer pasted on the heat insulation construction wall It is easy to control the climbing speed of the equipment, etc., and it is possible to visually control the injection foaming state, so it consists of rigid urethane foam and surface reinforcing material without requiring special work experience or advanced skill. The thickness accuracy of the heat insulating layer can be dramatically improved. In addition, the spacers affixed to the wall surface exert a damming function for preventing the outflow of liquid or gel-like urethane, and between the heat insulating layers of the unit construction area formed by foaming under a predetermined stock solution injection amount The thickness can be made uniform without any variation, and the spacer itself becomes a joint material for the connection points between the heat insulation layer ends of the unit construction area, and the surface of the joint is smooth over the entire wall surface without steps or uneven thickness. There is an effect that a heat-insulating layer having a good finish can be constructed.
[0026]
In particular, injection of urethane stock solution by using non-adhesive or difficult-to-adhesive release paper affixed to urethane on the surface side of the glass mesh used as the surface reinforcing material in the heat insulating layer of the unit construction area Insulation layer that prevents leakage during foaming and gives sufficient tension to the glass mesh with a property that makes it difficult to apply tension via release paper to prevent wrinkles on the surface and has a good appearance In this way, the predetermined reinforcing effect by the glass mesh can be surely exhibited by simply peeling and removing only the release paper after the construction.
[0027]
In addition, the present invention makes it possible to significantly improve the workability in a narrow space between the inner and outer double walls by making the inner surface of the outer wall of the inner and outer double walls in the low temperature tank to be constructed, and there is no generation of dust. The working environment can be further improved.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a heat insulation construction apparatus for a low-temperature tank wall according to the present invention and an outline of a heat insulation construction situation.
FIG. 2 is a front view of FIG.
FIG. 3 is an enlarged longitudinal sectional side view of a main part for explaining a heat insulation construction location.
FIG. 4 is a conceptual diagram of a main part for explaining a heat insulation construction state of a side wall part.
FIG. 5 is an enlarged front view of the main part showing the heat insulation layer construction part of the assigned unit construction area.
FIG. 6 is an enlarged cross-sectional view of the main part showing the structure of the applied heat insulating layer.
FIGS. 7A to 7G are schematic perspective views for explaining a conventional heat insulation layer construction method for a low-temperature tank wall surface.
[Explanation of symbols]
1 Inner tank in low-temperature tank 2 Outer tank in low-temperature tank 4 Steel liner surface (surface for heat insulation construction)
5 Hard urethane foam (PUF)
6 Glass mesh (an example of surface reinforcement)
7 Thermal insulation layer 7A-1 to 7A-N Thermal insulation layer in unit construction area 8 Gondola 9 Spacer 10 Pressing roller 11 Space 12 Presser plate 13 Release paper 15 Glass mesh supply device (surface reinforcing material supply device)
16 Urethane injection head 17 Traverser 18 Glass mesh for joints (surface reinforcing material for joints)

Claims (5)

It is a heat insulation layer construction method for a low temperature tank wall surface where a heat insulation layer composed of a rigid urethane foam and a surface reinforcing material for reinforcing the surface of the hard urethane foam is applied on the wall surface of the low temperature tank,
Paste spacers with the same thickness and the same thermal insulation properties as rigid urethane foam on the heat insulation wall surface of the above-mentioned low temperature tank in parallel with each other at a predetermined interval and in the vertical direction of the heat insulation wall surface After construction,
A roller that can be pressed against the surface of a pair of adjacent spacers and a presser plate that enters between the opposing surfaces of the pair of adjacent spacers and forms a space between the heat insulation construction wall surfaces from the lower end in the longitudinal direction of the spacer. While running toward the upper end in the longitudinal direction, the surface reinforcing material is sequentially fed out to the holding plate side of the space, and at the same time, a hard urethane stock solution is injected between the feeding surface reinforcing material and the heat insulation construction wall surface, and this injected hard Apply a heat insulating layer in the unit construction area where rigid urethane foam and surface reinforcing material are integrally molded between a pair of adjacent spacers so that the urethane stock solution is foamed and cured when it becomes the same thickness as the above spacers. ,
Thereafter, the surface reinforcing material for joints is pasted and applied to the surface of each spacer in a state of overlapping the end surface of the surface reinforcing material of the heat insulating layer of the unit construction area adjacent to both sides of each spacer. Insulation layer construction method for low-temperature tank walls.   The heat insulation layer construction method of the low-temperature tank wall surface of Claim 1 with which the said spacer is produced from the same urethane material as the rigid urethane foam formed by injection | pouring foaming. As the surface reinforcing material in the heat insulating layer of the unit construction area and the surface reinforcing material for joints to be affixed to the spacer surface, both glass meshes are used, of which the glass mesh used as the surface reinforcing material in the heat insulating layer of the unit construction area is used. The low temperature according to claim 1 or 2, wherein a release paper that is non-adhesive or difficult to adhere to urethane is affixed to the surface side, and the release paper is peeled and removed after the heat insulating layer in the unit construction area is applied. Insulation layer construction method for tank walls.   The method for constructing a heat insulation layer on a wall surface of a low temperature tank according to any one of claims 1 to 3, wherein the wall surface of the low temperature tank to be constructed is an inner surface of the outer wall of the low temperature tank of the inner and outer double walls. On the wall surface of the low temperature tank, it is a heat insulation construction device for the wall surface of the low temperature tank that is used when constructing a heat insulation layer composed of hard urethane foam and a surface reinforcing material covering the surface of the hard urethane foam,
The gondola suspended up and down along the insulation wall surface of the low temperature tank is parallel to the insulation wall surface of the low temperature tank at a predetermined interval and is linear in the vertical direction of the insulation wall surface. A pressing roller that can run against the surface of a pair of pre-made spacers with the same thickness and the same heat insulation properties as the hard urethane foam that is affixed to the wall , and between the opposing surfaces of the adjacent pair of spacers And a surface reinforcing material capable of sequentially feeding the surface reinforcing material to the holding plate side of the space when the gondola moves upward from the lower end in the longitudinal direction of the spacer toward the upper end in the longitudinal direction of the spacer. A urethane injection head for injecting a hard urethane undiluted solution between the supply device, the surface reinforcement material fed from the surface reinforcement material supply device, and the heat insulation construction wall surface. Is equipped with a de and traverser, as rigid polyurethane stock solution to be injected between the surface reinforcing member and the heat insulation construction wall from the urethane injection head is foamed and cured when it becomes the same as the thickness of the spacer, A heat insulation construction device for a wall surface of a low-temperature tank , wherein the foaming characteristics of the hard urethane stock solution, the injection amount from the urethane injection head, the presser load of the presser plate, the area of the presser plate, and the upward travel speed of the presser plate are set .

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