JPH025222B2 - - Google Patents

Description

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

In hazardous materials storage tanks, construction work is frequently performed to replace the annular plate and the subsequent bottom plate due to corrosion, uneven settlement, etc. Although tank foundation correction is required due to uneven settlement of the tank, the present invention does not require foundation correction as much as the conventional full-scale jack up method, and is suitable for tanks where foundation clearance correction using only the piece method is not possible. This is related to the jack-up method of replacing the lower annular plate and bottom plate of the side plate due to foundation modification.

Conventionally, in order to jack up a tank, generally, as shown in Fig. 8, a jig 2 such as a bracket is attached to the side plate 4, a jack 3 is installed directly below the bracket, and the tank body 1 is jacked up. As shown in Figure 2, the foundation 5 was dug up and jacks 3 were installed directly under the side panels 4 to perform jacking up.

However, in these conventional jack up construction methods, the use of the jacks is long, and installation of brackets and digging of foundations require large construction costs and long construction periods.

The present invention was made in view of the above-mentioned circumstances, and its purpose is to provide a construction method for efficiently and economically performing jack up.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for replacing the annular plate and bottom plate of an oil storage tank according to the present invention will be described below with reference to FIGS. 1 to 7.

In FIG. 1, reference numeral 1 indicates a tank body, 4 a side plate thereof, 6 a bottom plate, and 7 an annular plate. First, the cutting allowance 8 at the bottom of the side plate 4 is determined, and the side plate 4 is gas cut. At this time, the length of one cut is equivalent to one annular plate. Then, in order to prevent the side plate 4 from slipping on the existing bottom plate 6, guide pieces 9 are attached to the annular plate 7 on both the inner and outer sides of the side plate 4 by welding, as shown in FIGS. 2 and 3. In addition, there are 10 jacks with claws at intervals of about 2 to 4 m.
In order to install it, cut a part of the side plate 4 that remained on the annular plate 7 [approximately 300 m/m],
The mounting window hole 11 is formed by removing it.

Next, as shown in FIG. 4, a claw jack 10 is installed using the window hole 11, and the claw jack 10 supports the load of the tank body 1. Perform the above process all around.

After completing the installation of the jacks 10 around the tank, the jacks 10 are jacked up to the planned height to correct the tank body 1 horizontally. After finishing jack up, jack with claw 10
Attach a square piece or a jig to prevent it from falling.

Next, a claw jack 10 equivalent to one new annular plate 7a and the old annular plate 7
After removing, the foundation 5 is modified, a new annular plate 7a is installed, a side plate load support jig (support piece) 12 is attached to the side plate 4, and a guide piece 9 is attached to the new annular plate 7a. 6
(see Fig. 7) to support the load of the tank body 1. Apply this around the entire circumference of the tank. After the above process is completed, the tank body 1 is lowered onto the new annular plate 7a by cutting the side plate load supporting jig 12 little by little. With the above steps, the replacement work is completed.

Since the present invention is constructed by the method described above, it exhibits the following effects and is a practical invention as an annular plate and bottom plate replacement method.

(a) Since the bracket is not attached to the side plate, the stress generated on the side plate is small and safe.

(b) The period of use of the jack is short, and the construction cost is lower than that of conventional jack ups.

(c) Fewer reinforcing materials such as brackets and outer rings are required in the circumferential direction of the tank.

(d) There is no need to reinforce the lower foundation to install jacks.

(e) Replacement square timbers are not required.

(f) Can be carried out concurrently with concrete ring repair.

(g) It has many supporting points and can be constructed at a low location, making it safe.

(h) Since skilled workers are not required, costs can be reduced.

[Brief explanation of drawings]

Figure 1 is a partially cutaway front view of the oil storage tank.
Fig. 2 is a perspective view showing an embodiment of the annular plate and bottom plate replacement method according to the present invention, with a window hole made in the lower part of the tank for attaching a jack with a claw and a guide piece fixed therein, and Fig. 3 is the same as above. longitudinal side view,
Figure 4 is a perspective view of the tank lifted from the cut section at the bottom of the tank, Figure 5 is a vertical side view, Figure 6 is a perspective view of the final process of welding the side plate load support jig to the side plate, and Figure 7 is Similarly, FIGS. 8 and 9 are vertical side views showing the conventional jack up construction method. 1...Tank body, 4...Side plate, 5...Foundation,
7, 7a... Annular plate, 8... Cutting allowance, 9... Guide piece, 10... Jack with claw, 11... Window hole, 12... Side plate load support jig.

Claims (1)

[Claims] 1. The lower part of the side plate is divided into several sections and cut horizontally in sequence, and the process of fixing guide pieces to the annular plates on both the inner and outer sides of the side plate for each section to prevent the fused side plate from shifting; A process of fusing a part of the lower part of the side plate to open several window holes, installing jacks with claws in each window hole, and adjusting the tank body horizontally while jacking up the cut side plate to the planned height, Remove the claw jacks and old annular plates for each section, modify the foundation, install a new annular plate, attach support pieces to the side plates, and guide pieces to the new annular plates to load the tank body. A process of supporting the supporting piece and sequentially constructing it all around the tank, and a process of lowering the tank body onto the new annular plate by cutting the support piece little by little, that is, a combination of the piece construction method and the jack-up construction method. An annular plate and bottom plate replacement method for oil storage tanks consisting of: