JPH06300191A - Cold reserving panel laying method for low temperature tank - Google Patents

Abstract

PURPOSE:To facilitate laying of cold returning panels, each having a given size, over the inner wall of the tank body made of concrete of a low temperature tank. CONSTITUTION:In a method wherein cold reserving panels 1 each having a given size are laid over the inner wall 3 of a tank body 2 made of concrete, an insertion hole 4 'is formed in the cold reserving panel 1 in a manner to front on the inner wall 3 of the tank body and the inner wall 3 of the tank body is filled with a nut member 5 corresponding to the insertion hole 4. Thereafter, the cold receiving panels 1 are superposed with the inner wall 3 of the tank body. A bolt member 7 having a screwed joining part 7b, with which a fastening nut member 6 is previously joined in a screwed state is joined in a screwed state with a nut member 5 with which the inner wall 3 of the tank body is filled through the insertion hole 4 to fix the bolt member to the inner wall 3 of the tank body. By rotating the fastening nut member 6, the cold receiving panel 1 is laid in a nipped state over the inner wall 3 of the tank body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold insulation panel laying method for a low temperature tank, and particularly to laying a cold insulation panel having a predetermined size on the inner wall of a concrete tank body buried in the ground. It is about the method.

[0002]

2. Description of the Related Art Generally, an underground cryogenic tank, which is advantageous in terms of safety and space utilization, is used as a cryogenic tank for storing cryogenic liquid such as LNG or LPG. This underground low temperature tank is mainly composed of a bottomed cylindrical concrete tank body buried in the ground and a dome-shaped roof covering the opening of the tank body. A cold insulating material layer is laminated on the inner wall of a concrete tank body buried in the ground, and a membrane is stretched on this cold insulating material layer to form an internal tank for storing a low temperature liquid therein.

By the way, as a method of constructing an underground low temperature tank, first, the ground is excavated so that the tank body forming the outer shell is buried, and an excavation hole of a predetermined size is formed.
Concrete is placed inside the excavation hole to build a concrete tank body with a bottomed cylindrical body, and after forming a dome-shaped roof in the opening of this concrete tank body, a specified inside wall of the tank is formed. A cold insulation panel as a cold insulation material layer having a size is laid on top of one another, and then a membrane is stretched along the inner wall of the cold insulation panel to seal and complete.

In particular, as a method of laying a cold insulation panel on the inner wall of a concrete tank body, as shown in FIG.
First, in the process of constructing the tank body 2 by pouring concrete, the nut member 5 is planted so that the screwing groove faces the insertion hole 4 of the cold insulation panel 1 in the horizontal direction. As shown in FIG. 3, the nut member 5 previously planted on the inner wall 3 of the concrete tank body 2 has a cold insulation panel 1 as shown in FIG.
A bolt member 7 for being inserted into the insertion hole 4 is screwed. Particularly, since the bolt member 7 screwed to the nut member 5 is a cut bolt having no head for tightening, the bolt member 7 has two nuts 6a and 6a at its screwed portion. A lock nut 6b is formed so as to be attached to be close to each other, and a bolt member 7 having this lock nut 6b is attached to the nut member 5 to the lock nut 6b.
Will be screwed by rotating with a fastening tool or the like. Therefore, after the bolt member 7 is attached to the nut member 5, the lock nut 6b is removed from the bolt member 7.

As described above, the bolt member 7 attached to the inner wall 3 of the concrete tank body 2 is engaged by being inserted into the insertion hole 4 of the cold insulation panel 1 as shown in FIG. The nut member 6a is screwed to the bolt member 7 protruding from 4 through the washer 8 so that the cold insulation panel 1 is attached and laid on the inner wall 3 of the tank body 2.

The cold insulation panel 1 has several tens or more insertion holes 4 at a predetermined pitch, which are different depending on the size, and the concrete tank body 2 is correspondingly provided.
The bolt members 7 are provided so as to project on the inner wall 3 of the above, and innumerable bolt members 7 are provided so as to project on the inner wall 3 of the concrete tank body 2 according to the number of the cold insulation panels 1 to be laid. Become.

[0007]

By the way, according to the above, as shown in FIG. 2, when the tank body 2 is constructed with concrete, a large number of insertion holes 4 are formed in the cold insulation panel 1. Correspondingly, the same number of nut members 5 are planted on the inner wall 3 of the tank.

On the other hand, at the time of placing this concrete,
As shown in FIG. 5, a rotation deviation may occur in some of a large number of nut members 5 that are fixed in advance at a predetermined position before placing concrete, and the nut members 5 have a rotation deviation. The concrete may be solidified as it is and fixed to the inner wall 3 of the tank. Therefore, the bolt member 7a screwed and fixed to the nut member 5a having the rotational deviation has a predetermined deviation angle θ with respect to the vertical direction of the tank inner wall surface 10 and is inclined from the tank inner wall surface 10. Will be installed. On the other hand, regarding the positional relationship between the insertion holes 4 and the bolt members 7, only when all the bolt members 7 project vertically from the tank inner wall surface 10, all the bolt members 7 can be inserted into the insertion holes 4. If any one of the bolt members 7 becomes rotationally displaceable and cannot be inserted, all the cooling members cannot be inserted, and the cold insulation panels 1 are superposed on the inner wall 3 of the tank and temporarily supported by the bolt members 7. It will be impossible to let it happen. Therefore, conventionally, as shown in FIG. 4 and FIG. 5, the cold insulation panel 1 is once applied to the inner wall 3 of the tank to which the bolt member 7 is fixed, and the bolt member 7a having a rotational deviation is confirmed and then the cold insulation panel 1 is removed. After re-bending the bolt member 7a so that the bolt member 7a can be inserted into the corresponding insertion hole 4a or expanding the hole diameter of the insertion hole 4a, the cold insulation panel 1 is again applied to the inner wall 3 of the tank. , The bolt members 7 are inserted through all the insertion holes 4, the cold insulation panel 1 is superposed on the inner wall 3 of the tank and temporarily supported by the bolt members 7, and the bolt members 7 are screwed with the nuts 6 a through the washers 8. A method of sandwiching the cold insulation panel 1 on the inner wall 3 of the tank and laying it has been used.

However, at this time, if the deviation angle θ is too large, it can be confirmed that the rotation deviation occurs at the time when the bolt member 7 is screwed into the nut member 5a, and therefore, before the cold insulation panel 1 is applied. The measures were taken by the above method.

By the way, these works are dangerous because they may be works at high places on the gondola.
Since the cold insulation panel 1 has a relatively large surface area and a relatively large number of insertion holes 4 are formed, the work of inserting all the bolt members 7 into the insertion holes 4 is performed from the inside of the cold insulation panel 1. Since 7 is hard to see, it is very troublesome. Further, in order to insert the bolt member 7a having the above rotational deviation into the corresponding insertion hole 4a, the diameter of the insertion hole 4a may be enlarged, but this is an unfavorable means because it does not cause heat insulation performance or strength deterioration. That is clear. Further, since the diameter of the insertion hole 4 is slightly larger than the outer diameter of the bolt member 7, when the deviation angle θ of the bolt member 7a having a rotational deviation is small, the corresponding insertion hole 4
There is a case where it is forcedly inserted into a. At that time, the insertion hole 4a
There was also a problem that the area around might be damaged.

Therefore, an object of the present invention is to solve the above problems and provide a method for facilitating the laying of a cold insulation panel having a predetermined size on the inner wall of a concrete tank body of a low temperature tank. is there.

[0012]

To achieve the above object, the present invention provides a method for laying a cold insulation panel having a predetermined size on an inner wall of a concrete tank body, wherein the cold insulation panel is provided on the inner wall of the tank. The insertion hole is formed so as to face it, and a nut member is planted in the inner wall of the tank so as to correspond to the insertion hole, and then the cold insulation panel is superposed on the inner wall of the tank and the inner wall of the tank is inserted from the insertion hole. While fixing the bolt member in which the tightening nut member is screwed in advance to the nut member that is planted in the tank inner wall, the tightening nut member is rotated to place the cold insulation panel on the inner wall of the tank. It is sandwiched and laid.

[0013]

According to the above-mentioned method, the cold insulation panel is superposed on the inner wall of the tank, and the bolt members are attached to the nut members planted on the inner wall of the tank corresponding to the insertion holes from the many through holes formed in the cold insulation panel. Since the bolt member is fixed to the inner wall of the tank by inserting and screwing, even if there is a nut member with rotational deviation, the bolt member is screwed and fixed to the other nut members to fix the cold insulation panel to the inner wall of the tank. Can be supported by a superposed bolt member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the inner wall 3 of the concrete tank body 2 of the underground cryogenic tank buried underground.
As a method according to the present invention for laying the cold insulation panel 1 having a predetermined size, the cold insulation panel 1 can be used as in the conventional example.
A large number of insertion holes 4 are formed at predetermined intervals so as to face the inner wall 3 of the tank. The cold insulation panel 1 is molded from a cold insulation material such as hard urethane foam and has a predetermined thickness and a relatively large surface area. Further, the insertion hole 4 formed in the cold insulation panel 1 has the insertion hole 4
It has a hole diameter slightly larger than the outer diameter of the bolt member 7 that is inserted through. A working hole 11 is provided inside the cold insulation panel 1 so as to be connected to the insertion hole 4. On the other hand, a nut member 5 is planted on the inner wall 3 of the tank so as to correspond to the insertion holes 4. In these nut members 5, the end surface 12 on the side of the nut member engaging groove forms the same surface as the inner wall surface 10 of the tank, and the central axis of the nut member engaging groove 13 is planted on the inner wall 3 of the tank as a direction perpendicular to the inner wall surface 10 of the tank. Set up.

Further, in the present embodiment, the cold insulation panel 1 is configured such that the insertion hole 4 formed in the cold insulation panel 1 corresponds to the nut member 5 planted on the inner wall 3 of the tank. It is superposed on the inner wall 3 of the tank. Further, the bolt member 7, in which the tightening nut member 6 is previously screwed into the screwing portion 7b, in the present embodiment, the hexagon headed bolt, is inserted from the working hole 11 inside the cold insulation panel 1 through the insertion hole 4 into the tank body. The bolt member 7 is fixed to the inner wall 3 of the tank by inserting and screwing the nut member 5 planted in the wall 3 through the washer 8 so that the cold insulation panel 1 is superposed on the inner wall 3 of the tank. Temporarily supported by. Further, the tightening nut member 6 screwed to the bolt member 7 is rotated and tightened, so that the cold insulation panel 1 is sandwiched by the inner wall 3 of the tank and laid. After that, after the heat insulating material 14 such as glass wool is filled in the working hole 11, the lid 15 made of the same material as the cold insulating panel 1 is fitted into the working hole 11 to form the same surface as the inner surface of the cold insulating panel 1. Is inserted.

Next, the operation of the embodiment will be described.

As shown in FIG. 1, in this embodiment,
The cold insulation panel 1 is superposed on the inner wall 3 of the tank so that the insertion hole 4 formed in the cold insulation panel 1 corresponds to the nut member 5 planted on the inner wall 3 of the tank. Further, the bolt member 7 to which the tightening nut member 6 is screwed in advance is inserted from the work hole 11 inside the cold insulation panel 1 into the nut member 5 planted on the inner wall 3 of the tank from the insertion hole 4 through the washer 8. The bolt member 7 is screwed and fixed to the inner wall 3 of the tank. For this reason, since the bolt member head 16 for tightening the bolt member 7 does not pass through the insertion hole 4, as shown in FIG. 3, the lock nut 6b for tightening the bolt member 7 is tightened on the bolt member 7 as a conventional example. It is possible to omit the work of disposing the lock nut 6b again after the bolt member 7 is screwed and fixed to the nut member 5 by fixing. Further, in this embodiment, even if some of the nut members 5 planted on the tank inner wall 3 are misaligned with each other, the central axis of the other nut member screw groove 13 is the same as that of the tank inner wall surface 10. By using the nut member 5 fixed in the vertical direction, the bolt member 7 is inserted into the insertion hole 4 of the cold insulation panel 1 and screwed into the nut member 5, whereby the cold insulation panel 1 is attached to the inner wall 3 of the tank. It is possible to overlap and be temporarily supported by the bolt member 7. Along with that, even if the bolt members 7 are not inserted into all of the insertion holes 4 formed in the cold insulation panel 1, the cold insulation panel 1 is superposed on the inner wall 3 of the tank and temporarily supported by the bolt members 7. 1 is applied to the inner wall 3 of the tank once, and the bolt member 7 is screwed and fixed to the nut member 5, it is not necessary to support the cold insulation panel 1, and the cold insulation panel 1 is once applied to the inner wall 3 of the tank and removed and reapplied. The work can be simplified as compared with the conventional method.

On the other hand, as shown in FIG. 5, the bolt member 7a is inserted around the insertion hole 4 of the cold insulation panel 1 in order to screw the corresponding bolt member 7a into the nut member 5a having the rotational deviation. It should be deleted at the minimum necessary so that it can be screwed. At this time, since the cold insulation panel 1 is already superposed and supported on the inner wall 3 of the tank, the cold insulation panel 1
The shift of the nut member 5a can be easily confirmed from the inner working hole 14 through the insertion hole 4, and the above-described work of deleting can be easily performed. As a result,
Since the bolt member 7a is not forcibly inserted into the insertion hole 4a, the periphery of the insertion hole 4 of the cold insulation panel 1 is not damaged, and the minimum necessary number is deleted, so that the heat insulation performance and strength are also improved. There is no effect. Further, in the present embodiment, the bolt member 7 employs a hexagon head bolt because the outer diameter of the head portion 16 may be larger than the hole diameter of the insertion hole 4, but the bolt member 7 can be tightened. However, it is not necessary to be particular about the shape of the bolt member head 16, and for example, a round head bolt or the like can be adopted.

The method of laying a cold insulation panel on the inner wall of such a concrete tank body was applied to the case of an underground cryogenic tank in this embodiment, but it is a concrete tank to be installed on the ground. May be applied to.

[0021]

The present invention exhibits the following excellent effects.

(1) Since the bolt member is fixed to the inner wall of the tank after the cold insulation panel is superposed on the inner wall of the tank, even if there is a nut member having a rotational deviation, the bolt member is screwed to the other nut members. Then, the cold insulation panel can be supported on the inner wall of the tank.

(2) Since it is not necessary to fix the bolt member to the inner wall of the tank in advance and it is not necessary to provide the lock nut to the bolt member, the labor can be saved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention and showing a laid state of a cold insulation panel.

FIG. 2 is a diagram showing a laid state of a cold insulation panel in the present invention and a conventional example.

FIG. 3 is a view showing a conventional example and showing a bolt member fixed to the inner wall of the tank.

FIG. 4 is a side sectional view showing a conventional example and showing a laid state of a cold insulation panel.

FIG. 5 is a view showing a bolt member in which a rotation deviation has occurred, showing a conventional example.

[Explanation of symbols]

 1 Cooling panel 3 Tank inner wall 4 Insertion hole 5 Nut member 6 Tightening nut member 7 Bolt member 7b Screwing part

Claims (1)

[Claims] 1. A method for laying a cold insulation panel having a predetermined size on an inner wall of a concrete tank body, wherein an insertion hole is formed in the cold insulation panel so as to face the inner wall of the tank and the inner wall of the tank is formed. After the nut member is planted so as to correspond to the insertion hole, the cold insulation panel is superposed on the inner wall of the tank, and the nut member planted on the inner wall of the tank from the insertion hole is preliminarily fastened to the screwed portion. A cryogenic tank characterized in that a bolt member having a nut member screwed therein is fixed to the inner wall of the tank, and the tightening nut member is rotated to sandwich the cold insulation panel between the inner walls of the tank to lay it. Cooling panel laying method.