JPS6356385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved insulation construction method for a tank that stores low-temperature liquefied gas such as LPG and LNG.

Conventionally, construction methods shown in FIGS. 1 to 5 have been applied to insulate tanks for storing low-temperature liquids as described above.

In other words, 1 is a polygonal concrete outer tank that constitutes the tank, 2 and 3 are rectangular foamed synthetic resin insulation panels whose four sides are joined together, 4 is a fireproof sheet glued to the surface, and 5 is a polygonal concrete outer tank. An inner tank made of a thin metal plate for low temperature use such as a stainless steel plate, 6 an anchor bolt provided on the concrete outer tank, and 7 a welding stud fitting for supporting the metal thin plate forming the inner tank on the concrete side. As shown in Fig. 5, the heat insulating panels 2 and 3 are made into a set of three and pasted on one face of a polygon in the concrete outer tank. As shown in FIG. 2, insert the anchor bolt 6 into the stepped bolt hole 2a of the heat insulating panel 2 and tighten it with the nut 8. Pass the welding stud fitting 7 through the hole 2b in the center, and then Position another insulation panel 3 between the insulation panels 2, 2, insert the anchor bolt 6 into the bolt hole 3a, tighten it with the nut 9, and insert glass wool or rock wool into the gap on the low temperature side where the insulation panels 2, 3 are joined. The bolt holes 2a and 3 of the insulation panels 2 and 3 are filled with an elastic sealing material (not shown) such as a fiber sheet or a soft synthetic resin sheet.
a. The stud fitting insertion holes 2b are filled with synthetic resin fillers 10a and 10b, respectively, and the work of attaching a set of heat insulating panels 2, 2, and 3 is completed.

Figures 6 to 8 show the state in which the heat insulating panels are successively attached to two polygonal surfaces, and the concave shapes left at the joining joints of the heat insulating panels arranged horizontally and vertically. After filling the foamed synthetic resin insulation blocks 11 side by side to make a flat surface, as shown in FIG. complete the section.

Therefore, the above-mentioned set of heat insulation panels 2, 2,
In the pasting construction of 3, firstly, the insulation panels 2 and 2 of the same shape are
Position and fix 2 at the required distance,
After that, it is necessary to fit another heat insulating panel 3 between the heat insulating panels 2 and 2, which not only takes time but also
It is difficult to adjust the spacing dimensions l ₁ and l ₂ above and below 2, and overall workability is extremely poor.

The present invention has been made to solve the above-mentioned problems, and is an insulation construction method that enables efficient and accurate installation of insulation panels in the cryogenic liquid storage tank. The main purpose is to provide.

The insulation construction method for a cryogenic liquid storage tank according to the present invention is such that in insulation construction in which a plurality of dowel-shaped insulation panels are attached to a concrete outer tank equipped with anchor bolts, the insulation for one segment is After temporarily installing the panels on the hanging frame jig, filling the joints and joints of the insulation panels with sealant, and checking and adjusting the pitch of the bolt holes between the insulation panels using a female gauge formwork, 1.
The insulation panels for each segment were fixed to the hanging frame jig, while the pitch of the anchor bolts of the concrete outer tank was checked and adjusted using a female gauge formwork.
Lifting the hanging frame jig to face the surface of the concrete outer tank, inserting the anchor bolt on the outer tank side into the bolt hole of the insulation panel, screwing the nut, and then removing the hanging frame jig from the insulation panel. This method is characterized by repeatedly attaching insulation panels.

Hereinafter, the present invention will be explained in detail based on the drawings showing an example of its implementation.

FIG. 9 shows a female gauge form A used in carrying out the present invention, FIGS. 10 and 11 show a male gauge form B, and FIG. 12 shows a hanging frame jig C.

The female gauge formwork A is assembled into a rectangular shape with girder materials, and gauge plates 12 are provided at required locations, and the anchor bolts 6 of the concrete outer tank 1 are received thereto to confirm the mutual positions of the bolts. A gauge hole 13 is drilled for this purpose.

The male gauge formwork B is assembled into a rectangular shape with girders, and gauge plates 14 are provided at required locations, and the gauge plates 14 are inserted into the bolt holes 2a, 3a of the heat insulating panels 2, 2, 3. , a gauge shaft 15 is provided protrudingly for checking the mutual positions of the bolt holes.

The hanging frame jig C is assembled into a rectangular shape with girders, and the left and right girders are provided with handle operation suppressing members 16 for integrally holding the heat insulating panels 2, 2, and 3 for one segment as described above. is provided.

Next, the construction method for attaching the insulation panels 2, 2, and 3 to the concrete outer tank using the female gauge formwork A, the male gauge formwork B, and the hanging frame jig C is described in the 13th construction method. 20 will be explained.

(1) Place the female gauge formwork A against the surface of the concrete outer tank, correct any misaligned bolts, and check the bolt pitch so that the anchor bolts 6 are inserted into the gauge holes 13.

(2) Insulating panels 2, 2, 3 for the above 1 segment
As shown in FIG.
Place it on the hanging frame jig C installed on top of the panel, and fill the joints and joints of the insulation panel with sealant.

(3) At the same time, as shown in FIG.
Adjust the panels so that they are inserted into all the bolt holes 2a, 3a of the insulation panels 2, 2, 3 for one segment, and check the bolt hole pitch.

(4) Thereafter, as shown in FIG. 15, the heat insulating panels 2, 2, and 3 are clamped by the handle operation suppressing member 16 and tied and fixed with the fall prevention band 18.

(5) Next, the hanging frame jig C holding the heat insulating panels 2, 2, 3 is moved to the position where it is to be pasted by means of the transport cart 17 (see FIG. 16).

(6) Therefore, as shown in FIG. 17, the hanging frame jig C is lifted up with a crane or the like and placed facing the surface of the concrete outer tank, and as shown in FIG. The bolts are inserted into the bolt holes 2a, 3a of the heat insulating panels 2, 2, 3, and the stud fittings 7 are inserted into the holes 2b of the heat insulating panel 2.

(7) Next, remove the fall prevention band 18, and tighten the nut by screwing it onto the anchor bolt inserted into the heat insulation panel.

(8) After that, loosen the handle operation restraining member 16, remove the hanging frame jig C from the heat insulating panels 2, 3, and 3 fixed to the concrete outer tank side as shown in Fig. 19, and as shown in Fig. 20. Retract and then lower as shown.

(9) Repeat steps (1) to (8) above.

(10) After pasting the insulation panels, insert insulation blocks 11 into the joints and line them up, fill them with sealant, and fill the bolt holes with fillers 10a and 10b.

According to the above construction method, one segment of insulation panels is set in advance using a hanging frame jig, so filling the sealant into the joints of the joints is extremely easy and can be done reliably. . Moreover, construction accuracy and construction efficiency can be improved compared to construction in which each heat insulation panel is pasted one by one.

In addition, if you check the pitch of the anchor bolts in the concrete outer tank using a gauge formwork, and the pitch of the bolt holes in the insulation panel for one segment set on the hanging frame jig, you can easily check the pitch of the bolt holes in the insulation panel. This eliminates the need for rework during pasting work, making the work smoother.

As described above, according to the present invention, it is possible to greatly improve the efficiency and accuracy of attaching heat insulating panels to cryogenic liquid storage tanks, thereby shortening the construction period and reducing construction costs. .

[Brief explanation of the drawing]

Figure 1 is a plan view of the construction part of the insulation panel, Figure 2
The figure is an enlarged cross-sectional view, Figures 3 and 4 are perspective views of the insulation panels, Figure 5 is an explanatory diagram of the order of pasting the insulation panels using the conventional construction method, and Figure 6 is the pasting on the polygonal surface of the tank. Figure 7 is a plan view, Figure 8 is a side view, Figure 9 is a front view of the female gauge formwork, Figure 10 is a front view of the male gauge formwork, Figure 11 is a front view of the insulation panel group. The figure is a side view, FIG. 12 is a front view of the hanging frame jig, and FIGS. 13 to 20 are explanatory diagrams showing the order of attaching heat insulation panels. 1...Concrete outer tank, 2, 3...Insulation panel, 4...Fireproof sheet, 5...Inner tank made of thin metal plate,
6... Anchor bolt, 7... Stud fitting, 8
...Natsuto, 9...Natsuto, 10a, 10b...
Filling material, 11... Insulation block, A... Female gauge formwork, B... Male gauge formwork, C... Hanging frame jig, 12... Gauge plate, 13... Gauge hole,
14... Gauge plate, 15... Gauge shaft, 16...
Handle operation suppressing member, 17...Transportation trolley, 18
...Fall prevention band, 19...Moving scaffolding.

Claims (1)

[Claims] 1. In insulation construction in which a plurality of dowel-shaped insulation panels are attached to a concrete outer tank equipped with anchor bolts, the insulation panels for one segment are erected on a hanging frame jig,
After filling the joints and joints of the insulation panels with sealant and checking and adjusting the bolt hole pitch between the insulation panels using a male gauge formwork, fix one segment of the insulation panel to the hanging frame jig. On the other hand, the pitch of the anchor bolts in the concrete outer tank was checked and adjusted using a female gauge formwork, and the hanging frame jig was lifted to face the surface of the concrete outer tank, and the anchor bolts on the outer tank side were fixed to the insulation panel. A method for insulating a low temperature liquid storage tank, which comprises repeatedly inserting the hanging frame jig into a bolt hole, screwing a nut, and removing the hanging frame jig from the heat insulating panel to affix the heat insulating panel.