JPH0711808A - Connecting method for roof of storage tank to be erected by air-raising - Google Patents

Abstract

PURPOSE:To connect a roof of a storage tank with high connecting strength without requiring other reinforcing methods. CONSTITUTION:An annular roof connecting plate 3, extending inwardly, is installed to the edge of an opening on the upper end of a storage tank body 2 in a bottomed cylindrical shape. A roof 6, constructed by stretching a roof plate 5 in the size smaller than the bore of the roof connecting plate 3 over a roof framework 4, is formed on the inner bottom 2a of the storage tank body. After the roof 6 is lifted up by air-raising and the roof framework 4 is fitted against the roof connecting plate 3, a plate 7 is joined to the roof connecting plate 3 and the roof plate 5 by butt welding to fill a gap S between both of the plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a roof of a storage tank for air aging, in which the entire surfaces of roof plates are butt-welded.

[0002]

2. Description of the Related Art In the construction of a storage tank such as an underground tank, a roof connecting plate extending inward is provided at the upper opening edge of a bottomed cylindrical storage tank main body, and a roof plate is attached to the roof bone at the bottom of the storage tank. The air-raising method is used in which a stretched roof is formed and air is blown inside the roof to lift it to the position of the roof connecting plate.

In this air-raising method, when joining the roof lifted to the position of the roof connecting plate to the roof connecting plate, conventionally, as shown in FIG. 10, the roof connecting plate 3 is used.
A method has been adopted in which the roof plate 5 formed to have a size larger than the diameter D is brought into contact with the lower surface of the roof connection plate 3 and the roof plate 5 and the roof connection plate 3 are joined by fillet welding 13. Originally, it is preferable from the viewpoint of strength that the roof plate 5 is formed to have the same size as the diameter D of the roof connection plate 3 and these are butt welded. This is because it is difficult to fit the inside accurately.

[0004]

However, in the joining method of fillet welding described above, it is difficult to obtain high joining strength, and there is a problem that another reinforcing means is separately required to obtain high reliability. It was

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for joining a roof of a storage tank, which has a high joining strength and which does not require any other reinforcing means and which is highly reliable for air aging.

[0006]

In order to achieve the above object, the present invention according to claim 1 provides an inwardly extending annular roof connecting plate at an upper opening edge of a bottomed cylindrical storage tank main body. After forming a roof in which a roof plate having a size smaller than the diameter of the roof connecting plate is stretched on the roof bone at the bottom of the storage tank main body, and the roof bone is brought into contact with the roof connecting plate by air-aging the roof, It is characterized in that a plate material for closing the roof connecting plate and the roof connecting plate is butt-welded between the roof connecting plate and the roof connecting plate.

According to a second aspect of the present invention, an annular roof connecting plate extending inward is provided at an upper end opening edge portion of a bottomed cylindrical storage tank main body, and the roof frame has the roof at the inner bottom portion of the storage tank main body. A roof plate larger than the diameter of the connection plate is stretched, and a roof is formed by cutting out a part of the roof bone of the portion where the peripheral edge of the roof plate is located, and the roof is air-laid to form a roof bone. After contacting the roof connecting plate, the portion of the roof plate overlapping the roof connecting plate is cut and the roof plate and the roof connecting plate are butt-welded.

Further, in the present invention according to claim 3, an annular roof connecting plate extending inward is provided at an upper end opening edge portion of a bottomed cylindrical storage tank main body, and the roof is attached to the roof frame at the inner bottom portion of the storage tank main body. A roof plate larger than the diameter of the connecting plate is stretched and a roof is formed by cutting out a part of the periphery of the roof plate located on the roof frame, and the roof frame is made into a roof connecting plate by air aging the roof. After abutting, the portion of the roof plate overlapping the roof connecting plate is cut to butt-weld the roof plate and the roof plate connecting plate, and a plate material for closing the cut-out opening is butt-welded. I am trying.

[0009]

According to the joining method of the above construction, since the roof connecting plate and the roof plate are butt-welded directly or through the plate material, high joining strength can be obtained, no other reinforcing means is required, and high reliability is obtained. Sex is obtained.

[0010]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1 showing the first embodiment, 1 is a storage tank configured as an underground tank, and this storage tank 1 is provided with a bottomed cylindrical storage tank body 2 made of concrete. An annular roof connecting plate (knuckle plate) 3 extending inward is provided at the upper end opening edge of the storage tank main body 2, and the roof bone 4 is smaller than the diameter D of the roof connecting plate 3 in the roof bottom 4 inside the storage tank main body 2. The roof 6 in which the roof plate 5 is stretched is assembled and formed.

The roof connecting plate 3 has a bottom portion 2a inside the storage tank body.
It is intended to join and fix the roof 6 that has been air-laid to the upper end of the storage tank main body 2, and rises from the upper end opening edge of the storage tank main body 2 and the upper end is reduced to a diameter D smaller than the inner diameter of the storage main body 2. The diameter is. The roof 6 is formed in a convex shape with an outer diameter smaller than the inner diameter of the storage tank main body 2 at the bottom portion 2a in the storage tank main body 2. Specifically, the roof 6 has an outer diameter larger than the caliber D of the roof connecting plate 3 made of I-shaped steel. The roof frame 4 is assembled and formed, and the roof plate 5 is stretched on the upper surface of the roof frame 4.

Next, after the roof 6 is air-laid to bring the roof frame 4 into contact with the roof connecting plate 3, the roof connecting plate 3 and the roof plate 5 are closed as shown in FIG. The plate material 7 is butt-welded. In this case, since the roof plate 5 is formed smaller than the diameter D of the roof connection plate 3 as shown in FIG. 3, an annular ring extending along the circumferential direction is provided between the roof plate 5 and the roof connection plate 3. A gap S is formed, and the gap S absorbs a radial deviation between the roof plate 5 and the roof connection plate 3 due to air aging. After air aging, the roof 6 is temporarily fixed, for example, by welding the roof frame 4 to the roof connecting plate 3. The plate member 7 is formed by adjusting the size and shape of the gap S by a roof plate member, and is appropriately divided in the circumferential direction. Further, a groove 8 for performing butt welding from the outside of the roof 6 is formed in the butt portion of the plate material 7.

According to the above joining method, however, the plate member 7 for closing the roof connecting plate 3 and the roof plate 5 smaller than the diameter D thereof is butt-welded, so that the entire surface of the roof plate 5 is butt-welded. As a result of welding, high joint strength can be obtained, high reliability can be obtained without using other reinforcing means.

FIG. 4 shows a second embodiment of the present invention. As shown in the drawing, an annular roof connecting plate 3 extending inward is provided at the upper end opening edge of the bottomed cylindrical storage tank main body 2, and the inner diameter 2D of the roof connecting plate 3 is attached to the roof bone 4 at the storage tank main body bottom 2a. A roof plate 5 larger than that is stretched, and a roof 6 is formed by cutting out a part 9 of the roof bone 4 in a portion where the peripheral portion of the roof plate 5 is located. Next, after the roof 6 is air-laid to bring the roof frame 4 into contact with the roof connecting plate 3, the portion 10 of the roof plate 5 overlapping the roof connecting plate 3 is cut as shown in FIGS. 5 and 6. The roof plate 5 and the roof connecting plate 3 are butt-welded together.

In this case, the notch 9 formed in the roof bone 4
As a result, the portion 10 of the roof plate peripheral portion that overlaps the roof connection plate 3 escapes downward, and the space of the cutout portion 9 can be used to easily cut the overlapping portion 10 by gas cutting. After cutting, correct the deformation of the roof plate edge and connect the roof connecting plate 3
Butt welding may be performed by forming the groove 8 in the butted portion. According to the joining method of the present embodiment, the portion 10 of the peripheral portion of the roof plate 5 larger than the diameter D of the roof connection plate 3 and overlapping with the roof connection plate 3 is cut,
At that time, since the part 9 of the roof frame 4 where the peripheral edge of the roof plate is located is cut out, the part 10 located on the roof frame 4 can be easily cut, and the roof connecting plate 3 and the roof plate 5 can be completely removed. Since the butt welding is performed directly over the circumference, the plate material 7 is not required and high joint strength can be obtained.

FIG. 7 shows a third embodiment of the present invention. As shown in the drawing, an annular roof connecting plate 3 extending inward is provided at the upper end opening edge of the bottomed cylindrical storage tank main body 2, and the inner diameter 2D of the roof connecting plate 3 is attached to the roof bone 4 at the storage tank main body bottom 2a. A roof plate 5 larger than that is stretched and a roof 6 is formed by cutting out a part 11 of the roof plate peripheral portion located on the roof frame 4. Then, the roof 6 is air-laid to make the roof bone 4
After contacting the roof connecting plate 3 with the roof connecting plate 3, the portion 10 of the roof plate 5 overlapping the roof connecting plate 3 is cut to butt-weld the roof plate 5 and the roof connecting plate 3 as shown in FIGS. 8 and 9. At the same time, the plate member 7 that closes the notched opening 11 is butt-welded.

In this case, a portion 10 of the peripheral edge portion of the roof plate which overlaps with the roof connecting plate 3 is cut by gas cutting to correct the deformation of the end portion of the roof plate so that the roof connecting plate 3 is abutted and the abutting portion thereof is formed. The groove 8 may be formed and butt welding may be performed. According to the joining method of this embodiment, a portion 10 of the roof plate 5 having a diameter larger than the diameter D of the roof connection plate 3 and overlapping with the roof connection plate 3 is cut, and at that time, the roof located on the roof frame 4 is cut. Since a part 11 of the plate peripheral portion is cut out, it is not necessary to cut that part, and the cutout opening 11
Since the plate material 7 that closes this is butt-welded, and the roof connecting plate 3 and the roof plate 5 at other portions are butt-welded directly,
A high joint strength can be obtained without processing the roof bone 4.

In each of the above embodiments, the present invention is applied to an underground tank, but it can be applied to other types of tanks.

[0020]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) According to the joining method of claim 1,
Since the plate material that closes the roof connecting plate and the roof plate that is smaller than its diameter was butt welded, the entire surface of the roof plate becomes butt weld and high joint strength is obtained, and other reinforcing means are required. Therefore, high reliability can be obtained.

(2) According to the joining method of claim 2,
A portion of the roof plate that is larger than the diameter of the roof connecting plate and overlaps with the roof connecting plate is cut, and a part of the roof bone where the roof plate peripheral portion is located is cut out at this time, so that the roof bone It is possible to easily cut the located portion, and since the roof connecting plate and the roof plate are directly butt-welded over the entire circumference, a plate material is not required and high joint strength can be obtained.

(3) According to the joining method of claim 3,
A part of the peripheral edge of the roof plate that is larger than the diameter of the roof connecting plate that overlaps the roof connecting plate is cut, and at this time, a part of the peripheral edge of the roof plate located in the roof frame is cut out, so that part It is not necessary to cut, but butt-welding a plate material that closes it to the notched opening, and since the butt-welding of the roof connecting plate and roof plate of the other part is directly butt-welding, there is no need to process the roof bone, High bonding strength can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a storage tank showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a plan view taken along the line AA of FIG.

FIG. 4 is a sectional view of a storage tank showing a second embodiment of the present invention.

5 is an enlarged cross-sectional view of the main parts of FIG.

FIG. 6 is a plan view taken along line BB of FIG.

FIG. 7 is a sectional view of a main part of a storage tank showing a third embodiment of the present invention.

FIG. 8 is a plan view taken along line CC of FIG.

9 is a sectional view taken along line DD of FIG.

FIG. 10 is a partial cross-sectional view of a storage tank showing a conventional method for joining storage tank roofs.

[Explanation of symbols]

 2 Storage tank body 3 Roof connection plate 4 Roof frame 5 Roof plate 6 Roof 7 Plate material S Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Riki Naito 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (3)

[Claims] 1. A bottomed tubular storage tank main body is provided with an inwardly extending annular roof connecting plate at an upper end opening edge portion, and a roof having a roof frame at the bottom inside the storage tank main body is smaller than the diameter of the roof connecting plate. Forming a roof stretched with boards, aerating the roof to bring the roof bone into contact with the roof connecting plate, and then butt-welding a plate material that closes the roof connecting plate and the roof plate A method for joining roofs of storage tanks that performs air aging. 2. A bottomed tubular storage tank main body is provided with an inwardly extending annular roof connecting plate at the upper opening edge, and a roof frame at the inner bottom of the storage tank main body has a roof larger than the diameter of the roof connecting plate. After a plate is stretched and a roof is formed by cutting out a part of the roof bone of the portion where the peripheral edge of the roof plate is located, after the roof is air-laid to bring the roof bone into contact with the roof connecting plate A method for joining a roof of a storage tank for air-raising, characterized in that the roof plate and the roof plate connecting plate are butt-welded by cutting a portion of the roof plate overlapping the roof connecting plate. 3. A bottomed tubular storage tank main body is provided with an annular roof connecting plate extending inward at the upper end opening edge portion, and a roof frame at the bottom inside the storage tank main body has a roof larger than the diameter of the roof connecting plate. After extending a board and forming a roof in which a part of the peripheral edge of the roof plate located on the roof frame is cut out and airing the roof to bring the roof bone into contact with the roof connecting plate, The roof of the storage tank for air-raising, characterized in that the roof plate and the roof plate connecting plate are butt-welded by cutting the portion overlapping the roof connecting plate and the plate material for closing the cutout opening is butt-welded How to join.