JPH1061246A - Method of disassembling and repair construction of upper section of cylindrical storage-tank peripheral wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disassemble and repair only the upper section of the peripheral wall of a storage tank safely at a fixed place efficiently. SOLUTION: An annular ring-shaped reinforcing ring 6 is installed horizontally to the peripheral wall surface of a lower section at the place of disassembly and repair of the upper section 2U of a cylindrical storage-tank peripheral wall, the periphery of the upper section of the peripheral wall 2, on which the reinforcing ring 6 is mounted, is cut horizontally and separated into peripheral wall sections 2U, 2B at an upper stage and a lower stage, and rollers 9 rotatably supporting the separated peripheral wall section 2U at the upper stage are disposed at regular intervals. A process, in which the upper end section of the peripheral wall section 2U at the upper stage rotatably supported on the rollers 9 is cut partially and removed, and a process, in which the partially-cut and removed upper-stage peripheral wall section 2U is rotated and moved on the rollers 9, are repeated successively, and all of the upper-stage peripheral wall section 2U to be repaired are cut and removed at a fixed place, thus disassembling the upper section of the peripheral wall section. The upper-stage peripheral wall section 2U is assembled and repaired at a fixed place on the rollers 9, on which the upper-stage peripheral wall section 2U is dismantled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention disassembles an upper part of a peripheral wall which needs repairing a storage tank having a cylindrical peripheral wall made of steel, for example, a large floating roof type storage tank for storing crude oil and the like, and disassembles the upper part of the peripheral wall. The present invention relates to a dismantling repair method for assembling and repairing a new upper portion of a peripheral wall using a new peripheral wall member at a position.

[0002]

2. Description of the Related Art A large floating roof type storage tank having a steel cylindrical peripheral wall has a cylindrical storage tank 21 as shown schematically in FIG. On the upper part of the peripheral wall 22, a flange-shaped wind girder 23 formed by extending outward as a reinforcing material is welded using a bracket 24 so that the peripheral wall 22 is not deformed by strong wind or the like and does not buckle. Installed. At the upper part of the peripheral wall 22 to which the wind girder 23 is attached, rainwater easily accumulates at the joint with the wind girder 23, and furthermore, because of the heat of welding when the wind girder 23 is attached and welded, corrosion tends to occur. . In recent years, the need to disassemble and repair the upper portion of the peripheral wall 22 where the corrosion has occurred has been increasing.

[0003] As a first method of the conventional dismantling and repairing method for the upper part of the peripheral wall where the corrosion has occurred, although not shown, first, a wind girder attached to the upper part of the peripheral wall is cut by gas cutting or the like. The wind girder is lowered by heavy equipment such as a crane, transported and removed. Next, the upper part of the peripheral wall to which the wind girder was attached is dismantled by repeating gas cutting and dropping and removal of the cut peripheral wall material by a heavy machine sequentially from the upper end part to the corroded repaired part, and then dismantled. A new peripheral wall member is transported to the upper portion of the peripheral wall using a heavy machine such as a crane, and is stacked to assemble a new upper portion of the peripheral wall. After that, a dismantling repair method is generally adopted in which a new wind girder is attached to and repaired on a new upper part of the peripheral wall after the assembly and the welding and joining thereof are completed.

[0004] As a second conventional method, although not shown, a joint between a bottom plate laid on a foundation and a lower end of a peripheral wall is cut, and a bracket attached to an outer surface of a lower portion of the peripheral wall is cut off. A step of lifting the peripheral wall that cuts the joint with the bottom plate by contacting the head of the jack placed on the foundation, cutting and removing the lower part of the peripheral wall while lifting with the jack, and cutting and removing the lower part. Lowering the peripheral wall with a jack, replacing the bracket on the dropped peripheral wall and replacing the jack alternately repeats the process, cutting and removing the peripheral wall from below to the repair point upward and disassembling,
Thereafter, the disassembled peripheral wall portion is assembled in a reverse procedure to the disassembly by incorporating a new peripheral wall member into a lower portion of the peripheral wall being lifted by the jack, and joining the bracket to the bracket. After replacing the jack, the process of lifting the peripheral wall incorporating the new peripheral wall member is sequentially repeated to assemble a new peripheral wall, and then the peripheral wall lifted by the jack is lowered and joined to the bottom plate for repair. There is a well-known method of dismantling and repairing a corroded peripheral wall using a jack near the ground.

As a third conventional method, a peripheral wall having a large wall thickness near the ground is circumferentially cut in a spiral shape along a cutting line having a constant inclination with respect to the horizontal, though not shown in the figure. Separated into upper and lower peripheral walls, a roller is installed on the upper edge of the lower peripheral wall, the upper peripheral wall is rotatably placed on the roller, and the placed upper peripheral wall is placed from below to above. Toward, the step of partially cutting and removing the lower part of the upper peripheral wall part, and the step of lowering the upper peripheral wall part by rotating on the roller are sequentially repeated to disassemble the upper peripheral wall part to the repair point, and thereafter, A method of assembling the upper peripheral wall by alternately repeating the steps of assembling and joining a new peripheral wall member to the lower part of the upper peripheral wall in the reverse procedure of disassembly, and rotating the upper peripheral wall by rotating on rollers. By
There is known an invention in which a corroded peripheral wall is dismantled and repaired using a roller at a fixed location near the ground (see Japanese Patent Publication No. 3-45187).

[0006]

However, in the conventional dismantling and repairing method described above, the first conventional method involves cutting and removing the peripheral wall over the entire circumference of the storage tank to be dismantled and repairing. And the work of assembling the new surrounding wall member and carrying out the assembly work.Therefore, it is necessary to remove the piping connected to the storage tank and secure the open space where heavy equipment such as cranes can be moved around the storage tank for dismantling and repairing. In addition, the safety and efficiency of work must be reduced due to the complexity of moving the outer periphery of the storage tank of the cut dismantled pieces and new surrounding wall members, or the outer periphery of the storage tank of jigs and tools required for construction work. Was. In addition, since the upper part of the surrounding wall was dismantled and repaired with the wind girder removed, there was a concern that the surrounding wall could collapse if strong winds were applied during the construction period.

The conventional dismantling and repairing method using the second jack has an advantage that the construction can be carried out in a low place where it is hard to receive strong wind, but in order to disassemble and repair the upper part of the surrounding wall, the lower part of the surrounding wall is required. Extra work that must be dismantled and repaired occurs, and the work for the dismantled repair must be performed over the entire circumference of the storage tank to be dismantled and repaired, as in the first conventional dismantled repair method. Therefore, there is a problem inherent in the first conventional dismantling and repairing method, such as the necessity of securing an open space around the storage tank where a heavy machine such as a crane can be moved.

[0008] The conventional dismantling and repairing method using the third roller can be carried out in a fixed place in a low place where it is hard to receive strong winds.
In addition, there is no need to secure an open space where a heavy machine such as a crane can move around the storage tank for dismantling and repairing, and there is no need to move jigs and tools necessary for dismantling and assembly work. Despite having the advantage, the problem that the conventional demolition repair method using the second jack causes construction in low places, that is, the lower part of the peripheral wall is also demolished to repair the upper part of the peripheral wall that needs repair Had problems to do.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and there is no need to secure an open space around a storage tank to be dismantled and repaired, such as a crane, capable of revolving around heavy equipment. Dismantling and repairing method for the upper part of the cylindrical storage tank peripheral wall, which eliminates the need to move jigs and tools necessary for dismantling, and enables only the upper part of the peripheral wall of the storage tank that requires dismantling and repair to be safely and efficiently dismantled and repaired at a certain place Is provided.

[0010]

According to the present invention, there is provided a method for disassembling and repairing an upper portion of a cylindrical storage tank peripheral wall, wherein a circumferential annular reinforcing ring is horizontally mounted on a lower peripheral wall surface of a dismantling and repairing portion above the cylindrical storage tank peripheral wall. The upper part of the peripheral wall to which is attached is horizontally cut and separated into upper and lower peripheral walls, and a roller for rotatably supporting the separated upper peripheral wall is provided at an upper edge of the separated lower peripheral wall at a predetermined interval. The step of partially cutting and removing the upper end portion of the upper peripheral wall portion rotatably supported on the disposed roller, and removing the partially cut and removed upper peripheral wall portion on the roller. The process of rotating and moving is sequentially repeated to dismantle by cutting and removing all of the upper peripheral wall that needs to be repaired at a certain place, and then place the upper peripheral wall on a roller on which the upper peripheral wall has been dismantled. Intended to construction by assembled repaired, it is to efficiently short time and safely construction.

In addition, a side roller is provided on a lower side surface of the upper peripheral wall portion rotatably supported on the roller and is engaged with an upper side surface of the lower peripheral wall portion. This is a method of dismantling and repairing the upper part of the cylindrical storage tank peripheral wall so that the construction can be performed more safely without worrying that the upper peripheral wall on the roller will fall off even if strong winds are applied.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of an embodiment of the present invention, an example of disassembling and repairing an upper peripheral wall of a large-sized floating roof type cylindrical storage tank will be described with reference to FIGS.

First, a large floating roof type cylindrical storage tank 1 having a steel cylindrical peripheral wall 2 needs to be repaired. The upper part of the peripheral wall 2 that needs to be repaired, that is, the upper peripheral wall to which the wind girder 3 is attached using the bracket 4. A work scaffold 5 is attached over the entire inner and outer surfaces of the lower peripheral wall 2, and a circumferential annular reinforcing ring 6 is horizontally mounted on the peripheral wall of the peripheral wall 2 below the disassembly and repair location using the work scaffold 5.

The upper peripheral wall 2 to which the reinforcing ring 6 is attached is cut out in a horizontal band by gas cutting or the like, and the upper peripheral wall 2 cut in the horizontal band, that is, the upper peripheral wall 2 is cut.
A plurality of rollers 9 that rotatably support U are provided with the lower peripheral wall 2 cut out in the horizontal band shape, that is, the lower peripheral wall 2B.
Are arranged over the entire periphery at predetermined intervals on the upper edge of the.

The reinforcing ring 6 is provided with rigidity so that the wind girder 3 is removed to prevent the peripheral wall 2 from being deformed or buckled during disassembly and repair, even if a strong wind blows during the construction period. The upper peripheral wall 2B formed by cutting the thin upper peripheral wall 2 is formed of a section steel such as a channel steel or an H-shaped steel so that the opened upper end edge of the lower peripheral wall 2B has rigidity capable of securely supporting the upper peripheral wall 2U. An L-shaped plate jig 7 having one end welded to the peripheral wall 2 as shown in FIG. 3 and an inner surface of the peripheral wall 2 shown in FIG. 2 and FIG. It is mounted horizontally and circumferentially on the peripheral wall 2 by mounting using a square arrow jig 8 or welding by welding. In addition, if the existing wind girder 3 is cut into a block shape and then converted to the reinforcing ring 6 or the reinforcing ring 6 which also serves as the outer working scaffold 5 of the peripheral wall 2, economical demolition and repair work becomes possible.

As described above, the upper portion of the peripheral wall 2 to which the reinforcing ring 6 is attached is cut out in a horizontal band shape, and is cut to separate the upper and lower peripheral wall portions 2U and 2B, and the separated upper peripheral wall portion 2U is connected to the lower stage. It is formed so that it may be rotatably supported on rollers 9, 9,... Disposed on the upper edge of the peripheral wall 2B. After being formed in this way, as shown in FIG.
The upper peripheral wall 2U rotatably supported on the rollers 9, 9,... And the upper end of the wind girder 3 attached to the upper peripheral wall 2U were partially cut by gas cutting or the like, and were partially cut. The block-shaped demolition pieces are lowered and removed by using a heavy machine 10 such as a crane. And heavy equipment 10
The upper peripheral wall 2U, which has been cut and removed from the upper end of the upper peripheral wall 2U and the wind girder 3 attached to the upper end of the upper peripheral wall 2U, is positioned by rollers 9, 9,. Move by rotating counterclockwise arrow 1. Note that the rotational movement direction of the upper peripheral wall portion 2U may be a clockwise direction opposite to the illustrated direction as long as the rotation direction is constant until the disassembly is completed.

Next, the upper peripheral wall 2U which has been rotated and moved to a position near the stationary heavy equipment 10 and the upper end of the wind girder 3 attached to the upper peripheral wall 2U are partially cut again by gas cutting or the like. The partially cut block-shaped disassembled piece is lowered again using heavy equipment 10 such as a crane and removed. In this way, the upper end of the upper peripheral wall 2U rotatably supported on the rollers 9, 9, ... is partially cut including the wind girder 3 attached to the upper end of the upper peripheral wall 2U. The removal step and the upper peripheral wall portion 2U, which has been partially cut and removed, are provided with rollers 9, 9,.
The steps of rotating and moving in a certain direction on the top are sequentially repeated, and the entire upper peripheral wall portion 2U requiring repair is dismantled by sequentially cutting and removing from the upper part to the lower part in a fixed place where the heavy equipment 10 is installed.

After all dismantling of the upper peripheral wall portion 2U requiring repair is completed at a fixed place where the heavy equipment 10 is set, the rollers 9, 9,.
A new peripheral wall member is stacked on top of the heavy machine 10 and assembled. Thus, the upper peripheral wall 2 which forms a part of the upper peripheral wall 2U near the position where the heavy equipment 10 is settled
When the assembling of U is completed, the upper peripheral wall 2U after the assembling is rotated in a certain circumferential direction by using the rollers 9, 9,. And after that rotation,
The new peripheral wall member is stacked and assembled again using the heavy equipment 10.

In this manner, the step of stacking and assembling a new peripheral wall member on the rollers 9, 9,... Dismantling the upper peripheral wall section 2U, and the step of stacking and assembling the upper peripheral wall section 2U by assembling the peripheral wall member. , 9,... Are alternately repeated to assemble the entire upper peripheral wall 2 </ b> U at a fixed place where the heavy equipment 10 is installed.

The upper peripheral wall 2U, which has been rotated in the circumferential direction after assembly, is welded and joined at a certain place different from the assembly place to which the assembly has been successively moved, and the welded joint is also connected to the moved welding place. Inspection is performed sequentially and continuously at different fixed locations.

The wind girder 3 attached to the upper peripheral wall 2U assembled and joined and inspected as described above is provided in the same manner as the above-described method of assembling the upper peripheral wall 2U, that is, a new wind girder is attached to the upper peripheral wall 2U. The step of attaching the member using the new bracket member and the step of rotating and moving the upper peripheral wall portion 2U on which the new wind girder member is attached on the rollers 9, 9,. All the wind girder 3 attached to the part 2U is attached at a fixed place where the heavy equipment 10 is set. In addition, new wind girder 3 to upper section peripheral wall 2U
Is not limited to the above-described method. For example, the upper peripheral wall 2
At the time of assembling the U, a new wind girder member is attached to a new peripheral wall member using a new bracket material on the ground, and a method of assembling a new peripheral wall member to which the wind girder member is attached, that is, a method of improving efficiency. The wind girder 3 may be mounted using a method of easily stacking and assembling new peripheral wall members having increased rigidity by increasing the number of good ground welding operations and mounting the wind girder members.

Thus, as shown in FIG. 3, the upper peripheral wall portion 2U to which the new wind girder 3 is attached is mounted on the bracket 11 formed on the inner wall surface of the upper peripheral wall portion 2U with a shape steel or the like. Are supported by jacks 12, 12,... Fixed on a reinforcing ring 6 attached to the inner wall surface of the lower peripheral wall portion 2B, and then the rollers 9, 9,. U-shaped jigs 13 and 1 attached to the outer wall surfaces of the portion 2U and the lower peripheral wall portion 2B.
3, the upper peripheral wall 2U is lowered to the upper end of the lower peripheral wall 2B by a guide 14 formed of a channel steel or the like and inserted, and the lower end of the upper peripheral wall 2U and the lower peripheral wall 2B are lowered. The upper end is welded, the welded joint is inspected, and the repair is completed.

The upper peripheral wall 2U and the lower peripheral wall 2B
The guides 14 inserted in the U-shaped plate-like jigs 13 attached to the outer wall surfaces of the U-shape are distributed over the entire circumference with a space between them so that the upper peripheral wall portion 2U can descend while maintaining the horizontal level. Set up. Further, in the embodiment of FIG.
Is installed on the reinforcing ring 6 to improve the efficiency of construction and economical construction. However, a bracket 11 installed on the upper peripheral wall 2U is installed on the lower peripheral wall 2B, and the bracket 11 The jack 12 may be installed on the upper surface.

When the upper peripheral wall 2U is disassembled on the rollers 9, 9,... Disposed on the upper end edge of the lower peripheral wall 2B, the rollers 9, 9, which dismantle the upper peripheral wall 2U,
When assembling a new upper peripheral wall portion 2U by stacking a new peripheral wall member on the upper side, as shown in FIG. 2, both upper portions of the lower peripheral wall portion 2B are provided on both lower side surfaces of the upper peripheral wall portion 2U. The side roller 15 which engages with the surface is installed and constructed. As shown in FIG. 2, the side roller 15 has an upper end formed in a U-shape with a shaped steel or the like and an upper peripheral wall 2 </ b> U.
And the lower end to which the wheel 16 is attached is formed so as to face the upper side of the lower peripheral wall portion 2B with a clearance gap.

The thus formed side roller 15
Are installed along the entire circumference at opposite intervals on the inner and outer side surfaces of the peripheral wall 2, and even if a strong wind blows during the construction period, the upper peripheral wall portion 2 </ b> U during the dismantling and repairing is provided with the rollers 9.
The upper peripheral wall 2U is rotatable on the rollers 9, 9,... So that the upper peripheral wall 2U does not fall off due to horizontal movement from above the top 9 and does not hinder the disassembly and repair work of the upper peripheral wall 2U. In such a state, the separated upper and lower peripheral wall portions 2U and 2B are installed so as to be connected to each other, and the disassembly repair work described above is performed more safely. In the embodiment shown in FIG. 2, the side rollers 15 are arranged over the entire circumference so as to oppose the inner and outer side surfaces of the peripheral wall 2. However, only the inner circumference on one side or the outer circumference is spaced apart. It may be arranged only on the entire circumference and arranged economically.

In the embodiment of the present invention described above, an example of construction of a large-sized floating roof type cylindrical storage tank was introduced. However, the construction method according to the present invention employs a steel structure or a storage tank having a cylindrical peripheral wall, for example, a floating tank. This construction method can be applied to the work of dismantling and repairing the upper part of the peripheral wall such as an open top tank without a roof.

[0027]

As described above, in the dismantling and repairing method for the upper part of the peripheral wall of the cylindrical storage tank according to the present invention, the reinforcing ring is attached to the peripheral wall of the lower part of the dismantling and repairing part, so that the upper peripheral wall of the reinforcing ring is cut and separated. The upper edge of the lower opening is thinned and the upper edge of the opening is reinforced, so that the upper peripheral wall to be disassembled and repaired can be securely supported by the lower peripheral wall via rollers, and the wind girder is removed for construction. Even if strong winds strike during the construction period, the construction can be done safely without worrying that the surrounding wall during demolition and repair may collapse. In addition, on a roller arranged on the upper edge of the lower peripheral wall part which is separated into upper and lower parts by a horizontal cutting line, the upper peripheral wall part which needs repair is fixed and the heavy equipment is set up by repeating partial cutting removal and rotating movement sequentially. Repair is necessary because the dismantling is performed at the place, and the stacking and assembly of the new peripheral wall member and the rotational movement of the assembled peripheral wall are alternately repeated to assemble and repair all of the new upper peripheral wall portion at the fixed place where the heavy equipment is installed. Only the upper peripheral wall can be dismantled and repaired efficiently and for a short period of time.

A method of dismantling and repairing the upper part of the cylindrical storage tank peripheral wall, which is constructed by installing a side roller engaging with the upper side surface of the lower peripheral wall part on the lower side surface of the upper peripheral wall part rotatably supported on the roller, is constructed. The upper peripheral wall is connected to the upper and lower peripheral walls by a side roller while the upper peripheral wall is rotatably separated, so that even if a strong wind is applied during the dismantling and repair work, the upper peripheral wall moves horizontally. There is no fear of falling off, and the demolition and repair work can be performed more safely and efficiently.

[0029]

[Brief description of the drawings]

FIG. 1 shows an example of a method of disassembling and repairing an upper part of a cylindrical storage tank peripheral wall according to the present invention, in which a part of an upper peripheral wall part rotatably supported on a roller is partially omitted, and a partially exaggerated front view is shown. FIG.

FIG. 2 is a partially schematic perspective explanatory view showing an example in which side rollers are partially omitted and partially exaggerated.

FIG. 3 is a partial cross-sectional explanatory view showing a roller removal state partially omitted and partially exaggerated.

FIG. 4 is a front explanatory view showing a schematic structure example of a large floating roof type storage tank with a part cut away.

[Explanation of symbols]

1, 21 cylindrical storage tank 2, 22 peripheral wall 2B lower peripheral wall 2U upper peripheral wall 3, 23 wind girder 4, 24 wind girder bracket 5 work scaffold 6 reinforcing ring 7 L-shaped plate jig 8 square arrow jig 9 roller Reference Signs List 10 heavy equipment 11 jack bracket 12 jack 13 U-shaped plate jig 14 guide 15 side roller 16 side roller wheel

Claims (2)

[Claims] 1. A circumferential annular reinforcing ring is horizontally mounted on a lower peripheral wall of a dismantling and repairing portion above a cylindrical storage tank peripheral wall, and the upper portion of the peripheral wall to which the reinforcing ring is mounted is horizontally horizontally cut to form upper and lower peripheral wall portions. In the upper edge of the separated lower peripheral wall portion, a roller that rotatably supports the separated upper peripheral wall portion is disposed at a predetermined interval, and is rotatably supported on the disposed roller. A step of partially cutting and removing the upper end of the upper peripheral wall part and a step of rotating and moving the partially cut and removed upper peripheral wall part on the roller in order to repeatedly repair the upper peripheral part at a certain place Dismantling by cutting and removing all of the above, followed by assembling and repairing the upper peripheral wall in a fixed place on the roller that disassembled the upper peripheral wall, and dismantling and repairing the upper part of the cylindrical storage tank peripheral wall . 2. The method according to claim 1, wherein a side roller engaging with an upper side surface of the lower peripheral wall portion is installed on a lower side surface of the upper peripheral wall portion rotatably supported on the roller. 1. The method of dismantling and repairing the upper part of the peripheral wall of the cylindrical storage tank according to 1.