JPH08270226A - Tank side plate replacement method - Google Patents

Abstract

PURPOSE: To renew a side plate promptly and surely by mounting fixedly a reinforcing ring on an inner surface of a side plate at a part slightly higher inside than a renewal part of the side plate in the horizontal direction and laying out a plurality of vertical straight members with a specified spacing so as to receivingly support the ring. CONSTITUTION: A reinforcing ring 2 is horizontally fixed with an inner surface located slightly higher inside than a renewal part of a side plate 1a of a tank main body 1. A vertical straight member 3 is fixed with the inner surface of the side plate 1a for every specified spacing with a hose shoe 4 so as to support the ring 2 receivingly. Then, the side plate 1a to be renewed is removed from the lowest stage one after another and replaced with a new side plate 1a and welded and the side plate is cut down horizontally over the whole periphery at a part slightly higher than the renewal part. Then, the lower end of the vertical straight member 3 is alternately notched and fixed with jacks 13. Then, the fixing between the side plate 1a and the vertical straight member is loosened once and they are jacked up, thereby lifting up the side plates 1a located at a spot higher than the reinforcing ring 2 and a roof 1b by about 20mm and jacking down them after the replacement of the side plate 1a on the foremost upper stage. Then, they are welded after skin matching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a damaged portion of a tank side plate.

[0002]

2. Description of the Related Art When updating a damaged part of a tank side plate in a place where a mobile crane cannot be used, one existing side plate is removed, a side plate of that part is newly inserted, and the next side plate is renewed. The side plates are being updated in sequence. Therefore, the renewal of each sheet requires a long construction period, and many workers have to wait, which is inefficient and leads to an increase in cost.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tank side plate replacement construction method capable of quickly and reliably replacing the renewed portion of the tank side plate.

[0004]

Means of the present invention, that is, the structure is as follows. After fixing the reinforcing ring horizontally to the inner surface slightly above the side plate renewal part of the tank body, and after fixing the longitudinal member with the hose shoe at a predetermined interval on the inner surface of the side plate of the tank body so as to receive the reinforcing ring. While sequentially removing from the lowermost side plate renewal part, it is replaced by a new side plate and welded, and the upper part of the uppermost side plate renewal part is cut horizontally over the entire circumference, and then the lower end of the vertical threading member is While fixing the jack by notching it on the book holder, loosen the fixing of the side plate and the vertical threading member once, jack up and lift up the side plate and roof about 20 mm above the reinforcing ring, and complete the replacement of the top side plate It was designed to be jacked down to the skin and then welded. In addition, a mounting jig with a winch suspended is movably fixed to the handrail provided on the upper edge of the roof of the tank body, and the mounting jig does not fall over the open vent nozzle provided at the center of the roof with a wire rope. That is the endorsement.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 is a tank body, 1a is a side plate, and 1b is a roof. First, a scaffold A (existing one) is temporarily installed inside the tank body 1 at a distance of about 0,5 m to 1 m from the side plate 1a. Then, the reinforcing ring 2 is horizontally fixed to the side plate 1a slightly above the renewed side plate 1a, and the longitudinal members 3 are arranged at predetermined intervals (about 2000 mm) on the inner surface of the side plate 1a so as to support the reinforcing ring 2. The (channel material) is fixed by the hose shoe 4. At this time, the longitudinal member 3 is fixed to the hose shoe 4 by the arrow 5. Another roof 1
Two side plate lifting jigs 7 having triangular legs 7a are movably installed on the handrail 6 provided on the upper peripheral edge of b with wires or bands 8, and the rear end of each side plate lifting jig 7 is The open vent nozzle 1c provided at the center of the roof 1b is locked by the wire rope 9 to prevent the fall, and the side plate lifting jig 7 is used.
The winch 10 is suspended at the tip of the. Then, while being sequentially removed from the existing side plate 1a at the lowest stage of the renewal part, the new side plate 1a is replaced and welded. When removing the existing side plate 1a,
The width of the new side plate 1a is about 20 mm wider than that of the new side plate 1a so that the new side plate 1a can be easily assembled. Thereafter, the second side plate and the third stage are sequentially replaced with the new side plates 1a in the same manner as described above, and they are fixed to the upper part of the final side plate 1a (the sixth example in the illustrated embodiment), that is, the existing side plate 1a of the seventh stage. Mark the cutting scoring line 11 horizontally on the lower side of the reinforcing ring 2 based on the drawing size,
Cut horizontally with an automatic cutting machine over the entire circumference. After that, the lower end of the vertical threading member 3 is cut out every other one, the jack 13 is fixed to the cutout 12, and the side plate 1a and the vertical threading member 3 are temporarily loosened (the arrow 5 is loosened temporarily). Then, the side plate 1a above the reinforcement ring 2 and the roof 1b are lifted up by about 20 mm and the sixth step is replaced with the new side plate 1a, and then jacked down to fit the skin.

[0006]

According to the present invention, by using the vertical threading member, the side plate can be easily assembled, and further, even if the number of cut side plates is increased, the side plate is not lowered. Further, since cutting / removal and assembling work can be performed in parallel, the construction period can be remarkably shortened and the man-hour and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing the inside of a tank body.

FIG. 2 is an enlarged cross-sectional view showing a state in which a part of line AA in FIG. 1 is cut away.

FIG. 3 is a side view showing a state where a side plate lifting jig is attached to the roof of the tank body.

FIG. 4 is a front view of a side plate lifting jig.

[Explanation of symbols]

 1 Tank body 1a Side plate 1b Roof 1c Open vent nozzle 2 Reinforcement ring 3 Longitudinal member 4 Horse shoe 5 Square arrow 6 Handrail 7 Side plate lifting jig 7a Leg 8 Wire or band 9 Wire rope 10 Winch 11 Cutting score line 12 Notch 13 Jack A scaffolding

Claims (2)

[Claims] A reinforcing ring is horizontally fixed to an inner surface slightly above the side plate renewal portion of the tank main body, and a vertical threading member is attached to the inner surface of the side plate of the tank main body at a predetermined interval so as to receive the reinforcing ring. After fixing with a shoe, remove the side plate renewal part of the lowermost step and replace it with a new side plate and weld it, cut the upper part of the side plate renewal part horizontally slightly over the entire circumference, and then carry out the vertical threading Notch the lower end of every other member to fix the jack, loosen the fixing between the side plate and the vertical threading member, and then jack up to lift the side plate and roof above the reinforcing ring by about 20 mm.
A tank side plate replacement construction method, characterized in that after the uppermost side plate replacement is completed, the jack side is downed and the skin is brought into contact before welding. 2. A wire rope is movably fixed to a handrail provided on the upper edge of the roof of the tank body and a winch is hung, and an open vent nozzle provided at the center of the roof holds the attachment jig. The tank side plate replacement construction method according to claim 1, characterized in that the tank side plate is supported so as not to fall down.