JPH0249990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for replacing a bottom end plate of a storage tank.

Conventionally, in storage tanks such as petroleum tanks, corrosion tends to occur on the bottom end plates such as the annular plates that receive the most load from the side plates, etc. Therefore, when it becomes necessary to replace the annular plates, The jack-up method was adopted, in which, after cutting the side plate and the annual plate, the side plate is jacked up using a number of jacks, the existing annual plate is replaced with a new one, and after inspection, the previously jacked-up side plate is jacked down and lowered. ing. However, this type of jack up construction method requires a large number of expensive jacks, and when installing the jacks, it is necessary to cut out the tank slope to create a mound, use heavy jack bases and brackets, and it is necessary to raise the jacks. At this time, a large bending moment was applied to the side plates, which resulted in disadvantages such as the time required for jacking up.

Therefore, an object of the present invention is to eliminate such drawbacks in the conventional art by making it possible to easily replace and inspect bottom end plates such as annular plates without lifting up the side plates or using special jigs. It is an object of the present invention to provide a method for replacing the bottom end plate of a storage tank which can be done safely at low cost and in a short time.

According to this invention, the method for replacing the bottom end plate of a storage tank is to provide two openings at appropriate positions in the lower end of the side plate in the storage tank, and to replace the bottom end plate to be replaced through these openings. Cut off the bottom end plate,
Next, the bottom end plate and side plate to be replaced are cut off and carried outside the storage tank, and the new bottom end plate is replaced and welded to the adjacent bottom end plate, the opening in the side plate is closed, and the side plate and bottom end plate are removed. It consists of welding.

Other objects, features and advantages of the present invention will become apparent from the following accompanying drawings.

The accompanying drawings show an embodiment of the method for replacing the bottom end plate of a storage tank according to the present invention. In the storage tank bottom end plate replacement method of this invention, first, a score is drawn on the annual plate 2 which is the bottom end plate of the storage tank that requires replacement, and the side plate 1 in contact with the scored line is
An opening 3 is provided at the lower end. Opening 3 like this
By providing the annular plate 2 directly below the side plate 1, the annular plate 2 to be replaced can be cut along the scribed line by cutting the annular plate 2 directly below the side plate 1.
and cut it off. Next, install the required annual plate 2 and side plate 1.
The weld between the two is removed by gouging or the like, and the annular plate 2 is carried out of the storage tank and replaced with a new annular plate 2. After the new annual plate 2 and the adjacent annual plate 2' are mutually beveled, the annual plates 2 and 2' are welded together and inspected after welding. Subsequently, the opening 3 of the side plate 1 is restored and inspected, and the side plate 1 and the annular plate 2 are welded together and a post-welding inspection is performed to complete the replacement work of the annular plate 2. Furthermore, although this embodiment shows partial replacement of the annular plates, if multiple or all annular plates are to be replaced, the above-mentioned partial replacement work can be repeated sequentially along the circumference of the storage tank. good.

As described above, according to the present invention, when replacing a bottom end plate such as an annular plate of a storage tank, the opening provided at the lower end of the side plate can be used to cut, replace, and inspect the annular plate after replacement. In this way, the bottom end plate such as the annular plate of the storage tank can be easily and safely replaced in a short time and at low construction cost without lifting the side plate of the storage tank. In particular, it has advantages such as being a suitable method for partial replacement of the bottom end plate.

[Brief explanation of drawings]

The drawing is an enlarged perspective view of a storage tank showing the openings provided in the side plates according to the invention. In the figure,
1: side plate, 2: annular plate, 3: opening.

Claims (1)

[Claims] 1. In a storage tank, two openings are provided at appropriate positions at the lower end of the side plate, the bottom end plate to be replaced is separated from the adjacent bottom end plate through these openings, and the bottom end plate to be replaced is then separated from the bottom end plate to be replaced. By removing the weld between the end plate and the side plate, it is cut from the side plate and carried out to the outside of the storage tank, and at the same time, it is replaced with a new bottom end plate, welded to the adjacent bottom end plate, and the opening in the side plate is closed. A method for replacing a bottom end plate of a storage tank, comprising welding a side plate and a bottom end plate.