JPS6121381A - Method of construction of side plate for inner tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for constructing an inner tank side plate in a double-shelled cryogenic tank. .

[Prior art] In the construction of the inner tank side plate in a double-shell cryogenic tank,
The construction method of assembling the inner tank roof and outer tank roof at the bottom of the tank, air grading, setting the inner tank side plates, and sequentially welding them is conventionally used when the tank is above ground and there is a construction opening on the tank side wall. It has been adopted.

The conventional construction method for the inner tank side plate is as shown in Fig. 4.
A frame is installed in a ring shape on the bottom plate a, and the knuckle plate C1 and the outer tank roof 6 are assembled on the frame, and the outer tank roof e is assembled above the inner tank layer plate d via the supporting material f, The outer tank roof e is connected to the inner tank roof d. Next, a sealing material that seals the gap between the periphery of the outer tank roof e and the outer tank side plate g is attached to the outer tank roof e, and an air hole is created by closing the construction opening 1 of the outer tank side plate Q. , air is sent to the bottom of the roof from blower j, inner tank roof d, knuckle plate C1 outer tank roof e
The air raze starts from the two-dot chain line position to the solid line position at once.

After the roofs d and e of the inner and outer tanks are air-raised, the outer tank roof e is fixed to the outer tank side plate Q. Conventionally, after the outer tank roof e and the inner tank roof d are floated and installed in a predetermined position as described above, a construction opening i is opened, a cold insulation material and an annual plate k are installed, and then vertical The inner tank side plate pieces 1, which are divided into several parts in the direction and also in the circumferential direction, are brought in one by one through the construction opening i, and first, the vertical joints of each side plate piece 1 that makes up the lowermost inner tank side plate are welded. In the same way, the next inner tank side plate l is placed on the lowermost inner tank side plate 1 using a scaffold (not shown), and the side plate m is assembled with each other and with the side plate m and the lower tier. Weld the joint with the inner tank side plate 1 while moving the welding machine and scaffolding, and then assemble the upper inner tank side plate n at a high place by raising the scaffolding in the same way as above. This work is performed to weld the knuckle plate C and the uppermost inner tank side plate n.

[Problems to be Solved by the Invention] Therefore, in the conventional construction method for inner tank side plates, the lowermost inner tank side plate 1 can be constructed safely and efficiently; When assembling the upper inner tank side plate mark on the upper inner tank side plate M and then assembling the upper inner tank side plate N on the upper inner tank side plate M, the welding points will be moved upward one after another, so it is essential to use scaffolding. , it is necessary to move the scaffolding and set up the welding machine, resulting in poor workability. In addition, since the work involved high-altitude work, there was also a problem with the safety of the work.

The present invention aims to eliminate the above-mentioned drawbacks of the prior art by eliminating the need for high-place work and by performing welding work at a lower position to construct the inner tank side plate.

[Means for Solving the Problems] In the construction method of the inner tank side plate of the present invention, once the assembly of the inner tank roof and the outer tank roof is completed at the bottom of the tank, only a distance slightly longer than the height of one stage of the inner tank side plate is constructed. After supporting the inner tank roof and outer tank roof by air-raising the inner tank roof and the outer tank roof, the inner tank side plate pieces to be assembled are taken in, and after welding the vertical joints of each side plate piece, the inner tank roof is Lift the inner tank side plate pieces so that they come into contact with the knuckle plate that is integrated with the roof, weld them in the circumferential direction, close the construction opening again, perform air raising, support the roof in the same way as above, and then remove the inner tank from the construction opening. Take in the side plate pieces one by one and weld the vertical joints, then lift them up a little and align them with the lower ends of the inner tank side plate pieces that have already been installed, then weld them in the circumferential direction, and then repeat the same operation to assemble. The above-mentioned problems are solved by eliminating work at high places and eliminating the need for setting up scaffolding and welding machines.

[Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an outline of a device for carrying out the construction method of the inner tank side plate of the present invention, in which 1 is the outer tank side plate, 2 is the outer tank roof, 3 is the inner tank roof, and 4 is the inner tank roof 3. 5 is a construction opening, 6 is a blower that closes the construction opening and is connected to the construction roof 5 through a supply pipe 7, and 8 is a support member for supporting the outer tank roof 2 and the outside. A sealing material for sealing between the tank side plate 1, an inner tank annular 9, and a knuckle plate 1o are the same as those of the conventional one. What is necessary to carry out the construction work and method of the present invention is a work unit installed on the inner tank annular 9 and an inner tank for carrying the inner tank side plate 12 taken in from the construction opening 5 to a predetermined position. A roller 13 installed on the tank annular 9, a support 15 that supports the inner tank roof 3 via a support receiver 14 protruding from the inside of the knuckle plate 10, and a support 15 that supports the outer tank side plate stiffener 16 and the work unit 11. Automatic welding 117, 18 for cera 1, gouging and grinder (not shown), and jacks 19 arranged at appropriate intervals to lift the inner tank side plate 12 on the roller 13 for circumferential joint alignment. be.

The method for constructing the inner tank side plate of the present invention using the above-mentioned equipment is to first assemble the inner tank roof 3, knuckle plate 10, and outer tank roof 2 at the bottom, and then between the outer tank side plate 1 and the outer tank roof 2. In order to seal the gap between the roofs 2 and 3, a sealing material 8 is attached to the outer tank roof 2, the construction opening 5 is closed, and a blower 6 is used to remove the roofs 2 and 3.
Supply air to the bottom and erect and array the roof 2.3.

When air raising is performed until the lower end of the knuckle plate 10 is positioned slightly above the height of the vertically divided inner tank side plate piece 12a, the support receiver 14 on the inside of the knuckle plate 10 is received by the support 15, and the outer tank roof 2 and the inner tank are The entire load of the tank roof 3, knuckle plate 10, etc. is carried by lnaport 15.
Let me take it.

Next, the opening 5 is opened, and the inner tank side piece 12a, which has been divided to a size that can be inserted through the opening 5, is taken in from the opening 5, placed on the roller 13 with lυ, and carried to a predetermined position. When the inner tank side plate pieces 12a are arranged one after another on the circumference, the vertical joints of the side plate pieces 12a adjacent to each other in the circumferential direction are welded and covered. After that, the inner tank side plate piece 12a is pushed up with the jack 19, and the circumferential vertical joint part between the upper end of the inner tank side plate piece 12a and the lower end of the knuckle plate 10 is aligned, and then the stiffener 16 and the work unit 1 Automatic welding set to [1117, 18,
Perform circumferential welding using gouging and a grinder.

After the circumferential welding described above is completed, the construction opening 5 is closed again and air is blown from the blower 6 under the roofs 2 and 3 to create an air rain 1 of approximately the same amount as the air raising described above as shown in Fig. 2. The load of the roof is supported by supports 15 via 14. By the air raising described above, the inner tank side plate piece 12a welded to the knuckle plate 10 is floated to the original position of the knuckle plate 10.

Next, open the construction opening 5 and install the next inner tank side plate piece 1 in the same manner as above.
2b is taken in through the construction opening 5, and after welding the vertical joint, it is lifted up with jacks 19 and the circumferential joint portion between the lower end of the upper inner tank side plate piece 12a and the upper end of the lifted inner tank side plate piece 12b is welded.

Thereafter, the same operation as above is repeated to sequentially weld the lower inner tank side plate to the upper inner tank side plate at the same height position, thereby constructing the inner tank side plate.

[Effects of the Invention] As described above, according to the construction method of the inner tank side plate of the present invention,
The divided inner tank side plates were taken in from the construction opening, assembled into a ring shape at the bottom of the tank, and the upper end was circumferentially welded to the roof side.Then, the tank was supported by a predetermined amount of air raising, and the divided inner tank side plates were taken in and assembled again. When the inner tank side plate is circumferentially welded to the upper inner tank side plate, the inner tank side plate that has already been welded together with the roof is air-raised, and the lower inner tank side plate is sequentially welded at the same height position, so the circumferential welding is completed. Since the position does not change in the upper F direction and is always at a low place, work at heights as in the past is no longer required, improving work safety and work efficiency, and there is no need to change the setup of scaffolding or welding machines. An excellent effect can be achieved in that the number of man-hours can be reduced accordingly.

[Brief explanation of the drawing]

Figures 1 and 2 are examples of the L method for constructing inner tank side panels of the present invention, Figure 3 is a view from the ■ arrow in Figure 1, and Figure 4 is a conventional construction method for inner tank side panels. FIG. 1 is the outer tank side plate, 2 is the outer tank roof, 3 is the inner tank roof, 5 is the construction opening, 9 is the inner tank wall, 10 is the knuckle plate, 11
12 is a working unit, 12 is an inner tank side plate, 12a and 12b are inner tank side plate pieces, 15 is a support, and 17.18 is an automatic welding machine. Patent application: Ishikawajima-Harima Heavy Industries Co., Ltd. Figure 3 Figure 4.

Claims (1)

[Claims] 1) When the assembly of the inner tank roof, knuckle plate, and bottom of the outer tank roof is completed, these are supported by air raising to a position slightly higher than the height dimension of the inner tank side plate pieces that are to be divided and taken in, After welding the vertical joints of the taken-in inner tank side plate pieces, lift them up and circumferentially weld them to the knuckle plate. Next, after air-raising the inner tank side plate pieces located at the top level along with the roof etc. The inner tank is characterized in that the inner tank side plate pieces are taken in, assembled, vertical joint welded up, circumferentially welded to the upper inner tank side plate pieces, and the inner tank side plate pieces are added to the bottom by sequentially performing the same operation. Construction method for side panels.