JPS5919226B2 - How to build a tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a tank using the jack-up construction method.

With the jack-up method, even if the zero tank is extremely high compared to the radial direction, the work can be done safely and easily because there is no need to work at heights.

Since only small lifting equipment such as 0 crane is required,
Work can be carried out even when tank construction sites/sites and passageways are limited.

Approximately 70% of all work is done inside the tank, so it is less affected by the weather and can be done even in bad weather.

There are fewer jigs to attach to the 0 side plate, etc., and the appearance is beautiful.

0 Easy to maintain tank level and roundness.

There are advantages such as

Conventionally, in this jack-up method, as shown in Fig. 1, the first side plate 2 is attached on the bottom plate 1, and a jack-up space 3 is formed above this side plate 2 to allow insertion of a new side plate. new vertical welding between the side plates,
Lateral welding is performed between this new side plate and the side plate 4 which was jacked up in the previous process.

By the way, the width of the side plate is, for example, 250 cm, so the lateral welding is performed at a position of about 5 m.

For this reason, when constructing a tank adjacent to an existing tank or other equipment, a protective wall 5 to prevent ignition by welding is required around the area, and this protective wall 5 must be high (5 m or more). ) to become something.

Furthermore, since the insertion and welding of a new side plate is performed in the circumferential direction, for example, a tow truck must be driven around the tank, increasing the work area.

The present invention provides a tank construction method that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 2 to 11.

First, as shown in FIG. 2, the poured foundation 10 is checked.

Next, the bottom plate 11 is positioned, laid out, the sketched portion or the outer end of the annular part is welded, and a non-destructive inspection is performed.

Thereafter, the side plate support jig 12 is attached as shown by the imaginary line.

A plurality of side plate support jigs 12 are attached at appropriate intervals in the circumferential direction.

(c) As shown in FIGS. 10 and 11, the side plate support jig 12 includes a base plate 13 that can be attached to the bottom plate 11, a pair of support columns 14A and 14B erected from the base plate 13, and these support columns. Between 14A and 14B, there is a pedestal 15 which forms a surface 15a as a fixed holder, a roller 16 attached to this pedestal 15 and which forms a surface 16a as a sliding holder, and a surface 15a as both holders.

Supports 14A, 14B and frame 1 are installed to guide the side plate to 16a.
A guide body 17A provided between the guide body 5 and the guide body 17A.

17B, the surfaces 15a and 16a of both supports are arranged side by side between the pillars 14A and 14B, and the sliding direction is orthogonal to the direction in which they are arranged side by side, and the fixed support has surfaces 15a and 16a on the inside. It is attached to the bottom plate 11.

(C), as shown by the imaginary line in FIG. 3, the side plate support jig 12
An outer scaffold 20 is assembled over the entire length in the circumferential direction on the outer side of the outer scaffold 20, and an outer automatic welding machine running rail 21 is further assembled on the outer side of the upper end of the outer scaffold 20.

Then, as shown by the solid line in FIG. 3, the crane 18 mounts the uppermost side plate 19-+o onto the side plate support jig 12.

Next, the vertical joints of the side plates 19-to are welded.

This welding work is performed at the same place while mounting the side plate 19-1o, and the side plate 19-1o is connected by welding.
1°, the sliding receiver is sent in the circumferential direction while being received by the surface 16a, as shown by the solid line in FIG.

When a predetermined number of side plates 19-18 are welded, the sliding receiver is such that the group of side plates 19-1o supported by the surface 16a has a slightly enlarged diameter than the intended tank diameter, and one location in the circumferential direction. is not welded.

In this state, by tightening the unwelded ends so that they are in contact with each other, the diameter of the side plate 19-1o group is reduced to be the same as the tank diameter, and the fixed receiver is attached to the surface 15 as shown by the imaginary line in FIG.
Move to be caught by a.

This becomes the set position, and at this time vertical welding of the unwelded parts is performed.

■) As shown in FIG. 4, assembling and welding the roof 22,
This roof 22 and the uppermost side plate 19. Welding with o is performed.

This welding is performed by running an automatic external welding machine on the traveling rail 21.

Thereafter, a plurality of hydraulic jacking devices 23 are assembled in the circumferential direction inside the group of side plate support jigs 12.

This hydraulic jack device 23 includes a base 24 attached to the bottom plate 11, a support 25 from the base 24, and an elevating body 2 guided to the support 25 via a rack, a claw, etc.
6, a lifting locking piece 27 attached to the lifting body 26, and a receiving locking piece 28 attached to the upper part of the support column 25, which prevents the lifting and lowering movement of the lifting body 26 and is attached to the inner surface of the side plate 19-18. Both locking pieces 27 for the pair of pieces 29°30,
By engaging and disengaging 2B, the side plates 19-1o group can be jacked up.

(E) As shown in the solid line in Fig. 5, the hydraulic jack device 2
3, the side plate 19. .

And the roof 22 is jacked up.

As shown in the imaginary line in FIG. 5, the hydraulic jack device 2
Inside the third group, an inner upper scaffold 31 and an inner lower scaffold 32 are assembled over the entire length in the circumferential direction, and an inner automatic welding machine running rail 33 is further assembled inside the upper end of the inner upper scaffold 31.

34 indicates a support jig. (F''), as shown by the imaginary line in FIG. 6, the next stage side plate 19-0 is mounted on the side plate support jig 12 by the crane 18.

Then, the vertical joint is welded in the same manner as described in the previous section (C), and a small gap 35 is created between the vertical joint and the upper side plate 19-1o.

(0. As shown in FIG.
o is slightly lowered, and the lower end is brought into contact with the upper end of the side plate 19-9, and the two are temporarily welded together.

Thereafter, while running the automatic external welding machine on the traveling rail 21, automatic welding of the external surfaces of the horizontal joints between the side plates 19-10 and 19-9 is performed.

Then, a non-destructive inspection of the welded portion of the side plates 19-10 is performed.

(2) As shown by solid lines in FIG. 8, the roof 22 and both side plates 19-1o and 19-9 are jacked up by the hydraulic jacking device 23.

Then, as shown in the imaginary line, after mounting the next stage side plate 19-8 and welding the vertical joint, lower it slightly and weld the temporary attachment as described in the previous section (G), and then attach it to the top stage. At the same time, automatic welding of the inner surface of the horizontal joint between the side plates 19-1o, 19, 19-1o, 19-1, and the next stage is performed, and at the same time, the side plates 19-1o, 19-19, 19-1o, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, 19-19, . Automatically weld the outer surface of the horizontal joint between 19 and 8 (see Figure 7).

(υ) The side plates from the bottom to the second stage are mounted and welded in the same manner as described above, and Fig. 9 shows the process in progress.

(J) After completing the welding from the bottom to the second stage as described above, jack up the whole thing.

Then, the hydraulic pump portion of the hydraulic jacking device 23 assembled inside the tank is moved to the outside.

Next, the lowermost side plate 19-1 is inserted, and the vertical joint is welded.

After lowering the side plate 19-2 slightly to eliminate the gap 35, the side plates 19-2 and 19-2 of the second and third tier from the bottom are removed.
Perform automatic welding of the inner surface of step 3.

Furthermore, the side plates 19-2, 19- of the second row from the bottom and the bottom row
After welding for temporary attachment between 1 and 1, both side plates 19-2, 1
Perform automatic welding of the outer surface between 9-1 and manual welding of the inner surface.

Next, after removing the side plate support jig 12 on the bottom plate 11, the entire tank is lowered onto the bottom plate 11, and the scaffolds 20, 31, 32 inside and outside the tank and the hydraulic jacking device 23 are removed.

Wholesalers, between paragraphs (5) to (J) above,
Welding and inspection are performed on the rectangular portion of the bottom plate 11.

(L) After that, fillet welding of the lowermost side plate 19-1 and the bottom plate 11, and welding of the sketch part and the rectangular part of the bottom plate 11 are performed, and a non-destructive inspection is performed.

Then, a comprehensive inspection such as a water filling test is performed.

As described above, according to the present invention, when manufacturing the annular side plates of each stage, the divided side plates can be supplied from a specific location, and the vertical welding between the divided side plates can also be performed at a specific location. Even if welding occurs, it can be carried out without any problems, and automatic welding can also be performed.

In addition, the horizontal welding between the fabricated side plates can be carried out reliably and easily with the lower side plate positioned on the surface and set to prevent wobbling. By running the welding machine on the inner and outer running rails, it is possible to automatically and reliably weld the inner and outer surfaces.

Also, the welding level can be made the lowest, so that no protective wall is required or only one of the minimum height is required.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a conventional example, Figs. 2 to 11 show an embodiment of the present invention, Figs. 2 to 8 are longitudinal sectional front views of main parts showing the construction state, and Fig. 9 10 is a partially cutaway perspective view of the construction in progress, FIG. 10 is a front view of the side plate support jig, and FIG. 11 is a plan view thereof. 11...Bottom plate, 12...Side plate support jig, 16-a...Sliding receiver is surface, 18...
Crane, 19-16 to 19-1...Side plate, 2
1... External automatic welding machine running rail, 22...
... Roof, 23 ... Hydraulic jacking device, 33
...Inner automatic welding machine running rail.

Claims (1)

[Claims] 1 The fixed cost is a surface and the sliding receiver is a side plate support jig that has a surface and is placed at multiple locations in the circumferential direction on the bottom plate with the surface facing inside, and at a specific location, the topmost side plate support jig is placed on the side plate support jig. The side plates were installed one after another, and the sliding bridge was moved in the circumferential direction on the surface while vertical welding was performed, and the fixed cost was absorbed on the surface by tightening and reducing the diameter with one spot in the circumferential direction unwelded. After that, the unwelded parts are vertically welded to create an annular uppermost side plate, and the roof is attached to this uppermost side plate, which is then lifted by a hydraulic jacking device, and the next side plate is finally fixed. After the cost is fabricated on the surface, the uppermost side plate is lowered and the upper and lower ends of both side plates are brought into contact, and then the welding machine is run on the annular running rail installed on the outside, and the uppermost side plate is lowered to touch the upper and lower ends of both side plates. The tank was constructed step by step by horizontally welding the outer surface, then lifting the next stage side plate, and repeating the fabrication of the side plate. At the same time, the welding machine was run on the annular running rail installed inside, and the space between each stage side plate was welded. A method of constructing a tank, characterized by horizontal welding of the inner surface.