JP2014005660A - Partial renewal construction method for shell plate of tower tank - Google Patents

Abstract

The present invention provides a partial renewal method for a trunk plate of a tower tank that can efficiently perform renewal work while maintaining a required strength and can shorten a construction period.
A reinforcing member is formed on a lateral side of an opening 6 on an outer surface of a body plate 1 before a cylindrical body plate portion 2 is partially cut and removed in a circumferential direction to form a square arc plate-shaped opening 6. 200 is attached by welding and reinforced, and the reinforcing member 200 is fixed by welding in the vicinity of the diagonally outer sides of the upper and lower corners of the opening 6, and the upper and lower reinforcing plates 202 and 202. Both ends of the reinforcing member 200 are fixed to the upper surface of the steel plate 1 by welding and the vertically extending vertical member 204 is fixed to the body plate 1 by welding. Thereafter, only the vertical member 204 of the reinforcing member 200 is removed, and the reinforcing plate 202 is removed. , 202 is left.
[Selection] Figure 15

Description

  The present invention relates to a partial renewal method for a trunk plate of a tower tank that partially updates the trunk plate of the tower tank.

In column tanks such as the atmospheric distillation unit of the oil refining unit and the main distillation column of the vacuum distillation unit, it is necessary to renew or repair a part of the shell plate due to corrosion after many years of use.
When renewing the shell plate of large towers such as the main distillation tower, use a large crane to remove the entire towers by batch or division and update the whole towers to new ones. There is a construction method.
There is also a method of renewing only the corroded cylindrical body portion of the body plate. In this construction method, for example, when the cylindrical body plate part to be updated is an intermediate part of the body plate, the upper body is removed using a large crane, and then the cylindrical body plate part to be updated is integrally removed. After installing the new integral cylindrical shell plate, the removed upper shell is replaced.

Further, there is a stainless steel plate lining method in which, for example, a stainless steel thin plate having a thickness of 2 to 3 mm is attached to the entire inner circumference of the corroded and thinned portion of the body plate by welding.
Further, there is a metal spraying method in which a corrosion resistant metal particle such as Hastelloy or Inconel is sprayed on the inner surface of the corroded portion of the body plate which has been corroded to form a porous corrosion resistant film.

  However, the construction method for renewing the entire tower tanks requires a long construction period of several months, and there is a problem that the operation is stopped for a long period of time. Moreover, since a very large space is required for large crane installation and equipment temporary storage, it is necessary to remove peripheral devices temporarily. Moreover, since the whole is updated and it is necessary to remove peripheral devices, the construction cost becomes high. Moreover, the danger in construction is great.

  Moreover, in the construction method in which the corroded cylindrical body portion of the body plate is integrally removed and a new integral cylindrical body portion is attached, there is a problem that a construction period of about 3 to 4 months is required. . In addition, there is a problem that a very large space is required for installation of a large crane, temporary storage of equipment, etc., construction cost is high, or construction risk is high.

In addition, the stainless steel plate lining method does not renew the body plate, so that there is a problem that the construction reliability is low or that repairing is necessary. In addition, there is a problem that the cost effectiveness is low, or if corrosion progresses and the body plate becomes too thin, it cannot be dealt with.
Further, the metal spraying method is an emergency treatment, and is not suitable when the construction range is wide, or there is a problem that the sprayed coating may be peeled off due to a corrosive environment.

  Therefore, in the cited document 1, it is a construction method for renewing a cylindrical body part of a part of a body plate of a tower tank, and the renewed cylindrical body part is partially cut and removed in the circumferential direction. A method of renewing a cylindrical body plate part by repeatedly attaching a new divided plate (a new partial body plate) to the generated opening is proposed.

  The method of renewing the cylindrical shell plate part of the shell plate of this tower tank, for example, when partially updating the shell plate of the main distillation tower of the atmospheric distillation unit of the oil refining device or the vacuum distillation device The application will be described as follows.

  In the partial renewal method of the main plate of the main distillation tower, first, the portion that has been thinned due to corrosion of the main plate is investigated, and the range to be renewed is determined. The main distillation column is a large column (distillation column) having a cylindrical cross-sectional shape, and the diameter of the body plate of the body is about 4 to 10 m. And as shown in FIG. 25, the cylindrical body part 2 of the part of the intermediate part of the up-down direction among the body boards 1 of the main distillation column is changed into a new thing. In this example, the cylindrical body plate portion 2 to be updated is a portion from the lower side of the twelfth tray 11 to the upper portion of the fifteenth tray 11 and has a dimension of about 3 to 4 m, for example. It is. The even-numbered (12th, 14th) and odd-numbered (13th, 15th) trays 11 are respectively provided on the lower surface side and the upper surface side of the major beam 12 of the frame structure.

  And in the partial renewal method of the main plate of the main distillation tower, a divided plate having a shape obtained when the cylindrical main plate portion 2 is equally divided into a plurality of portions in the circumferential direction is newly manufactured, and the cylinder The cylindrical body plate part 2 is replaced with a new cylindrical body plate part by repeatedly inserting and welding this new divided plate in the opening formed by partially punching the body body plate part 2 in the circumferential direction. Change to

The new divided plate is manufactured in advance in a factory and transported to the site.
Here, the manufacturing method of a new division board is demonstrated.
In addition, before manufacturing work in this factory, of course, it is necessary to grasp the dimensions and conditions of each part including the cylindrical body plate part 2 of the main distillation tower for manufacturing new divided plates and the like. is there.
First, as shown in FIG. 26, the new divided plate (new partial body plate) 3 is obtained when the cylindrical body plate part 2 to be updated is divided equally into a plurality (12 in this example) in the circumferential direction. A square arc plate shape (a square plate shape in a front view and an arc plate shape in a plan view). The new divided plate 3 is manufactured by cutting a rectangular plate material having a predetermined size and then bending it into a predetermined arc surface. A groove for welding is applied to the outer periphery of the four sides of the new divided plate 3. In addition to the new dividing plate 3, as shown in FIGS. 27 (a) and 27 (b), the nozzle 21, the manhole 22, and the tray inner parts (support ring 23, Clamp bar 24, bolt bar 25, footrest 26, etc.), and as shown in FIG. 27 (d), new external parts for mounting (moving lift lug 27, landing / ladder clip 28, etc.) are manufactured. As shown in FIG. 28, in the case of the new divided plate 3 with a nozzle, the nozzle 21 is welded to the new divided plate 3 and the welded portion is inspected. In the vicinity of the nozzle 21, a nozzle deformation preventing member 29 is attached to prevent the nozzle 21 from being deformed or damaged due to contact with the nozzle 21 or from being deformed by welding.

Next, as shown in FIG. 29, twelve new divided plates 3 are assembled into a cylindrical shape, and are temporarily welded.
Next, as shown in FIG. 30, reference orientations 31 are entered in the upper and lower central portions of each new divided plate 3. Further, a ruled line 32 for attaching internal parts such as the support ring 23, the clamp bar 24, the bolt bar 25, and the footrest 26 is entered. Further, a ruled line 33 for attaching external parts such as a lift lug 27 for movement and a clip 28 for ladder is written.

Next, as shown in FIG. 31, the inner part and the outer part are attached. Moreover, the lift lug 27 for movement for trolley movement is attached. In addition, as shown in FIG. 32, components (for example, tray support ring) are not attached to the connection part of each new division board 3, but it attaches in the field.
Then, when the attachment of the inner and outer parts is completed, the temporary welding is removed and disassembled into a single new divided plate 3 as shown in FIG. Then, these new division boards 3 are conveyed to a construction site.

Next, a method for updating the cylindrical body plate portion 2 in the field will be described.
First, a scaffold and a trolley station are temporarily installed near the cylindrical body plate portion 2.
Next, the heat insulating material around the cylindrical body plate portion 2 is disassembled.
Next, the piping and external parts that obstruct the renewal work are temporarily removed.
Next, as shown in FIG. 34, between the 12th tray 11 and the 13th tray of the cylindrical body plate portion 2, and between the 12th tray 11 and the 13th tray, respectively. The doorway 4 is provided by opening a hole. And the tray floor 14, the downcomer 15 etc. which are installed in the tray 11 of the part of the update range of the cylindrical trunk | drum board part 2 are removed, and it carries out outside from these entrances and exits 4. The number of the entrances / exits 4 may be increased a little or one. The major beam 12 is left as it is.

  Next, as shown in FIG. 35, the cutting position (cutting line) is marked on the inside of the cylindrical body plate portion 2 with reference to the existing support ring. After that, a hole is drilled from the inner side to the outer side of the cylindrical body plate portion 2 with a drill at an intersection (a reference point) of the ruled line for cutting. Thereafter, a ruled line 38 for cutting is written on the outside of the cylindrical body plate portion 2 with reference to the hole 37. In addition, the reference azimuth 39 is entered. Thereafter, clips 41 for cutting machine guides are attached by welding at intervals along the circumferential direction on the outer side (outer surface) of the lower body plate 1 at the upper and lower cutting positions with reference to the outer ruled lines 38. . Further, a clip 42 for attaching a trolley beam for moving the cut cut body plate portion and the new divided plate 3 around the cylindrical body plate portion 2 is attached by welding. The clip 42 for attaching the trolley beam is attached to the entire circumference along the circumferential direction on the upper side of the cylindrical body plate portion 2 (part of the clip 42 is not shown in the figure).

  Next, as shown in FIGS. 36 and 37, the trolley beam 45 is attached to the clip 42 for attaching the trolley beam, and the trolley beam 45 is provided on the entire upper side of the cylindrical body plate portion 2 along the circumferential direction (each In the drawing, a part of the trolley beam 45 is not shown.) Further, the cutting machine guide 46 is attached to the cutting machine guide clip 41. This cutting machine guide 46 is installed in one cutting range among the upper and lower cutting parts of the cylindrical body plate portion 2, and moves the mounting position in the circumferential direction as the cutting range moves. Further, the measure beam 12 is removed from the bolt bar and placed on the lower tray 11 (the eleventh tray 11) of the cylindrical body plate portion 2. When an opening described later is formed, it is carried out to the outside. .

  Next, an opening for attaching the new divided plate 3 is formed. The openings are provided in two portions of the cylindrical body plate portion 2 that are opposed in the circumferential direction (positioned as point objects in plan view). That is, as shown in FIG. 36 and FIG. 37, first, the circular plate is vertically moved along the circumferential direction by using the cutting machine guide 46 in each of two circumferentially opposed portions. Cut into shapes. The length of the cut portion is set slightly longer on both sides than the width of the new divided plate 3 attached to the opening. Then, as shown in FIG. 38, it cut | disconnects up and down so that the right-and-left end part of an up-and-down cutting part may be connected, respectively, and the two parts which oppose the circumferential direction of the cylindrical trunk | drum board part 2 are square circular-arc plate shape. (Square shape is square in front view and arc shape in plan view). The cut square circular plate-shaped cutting body plate portion is moved and removed using the trolley beam 45. Thereafter, a groove processing for welding is performed on the upper and lower sides of the square arc-shaped plate-like opening 6 formed by cutting in this manner.

  Next, as shown in FIG. 39, the new divided plates 3 are respectively attached to the openings 6 formed to face the circumferential direction of the cylindrical body plate portion 2. That is, the new divided plate 3 is fitted into a predetermined position of the opening 6, and the upper and lower sides of the new divided plate 3 are fixed to the upper and lower body plates 1 of the cylindrical body plate portion 2 by welding. At this time, the reference azimuth 39 and the reference azimuth 31 are aligned so that the new divided plate 3 is not displaced from the predetermined fixed position. The new dividing plate 3 moves using the trolley beam 45.

  Thereafter, in the same manner, the openings 6 are formed in two portions of the cylindrical body plate portion 2 facing each other in the circumferential direction, and the new divided plate 3 is attached to each opening 6 repeatedly. Adjacent new divided plates 3 are butt-joined by welding. The order of forming the opening 6 and attaching the new divided plate 3 is performed, for example, as indicated by arrows and order numbers in FIG. That is, two new divided plates 3 that have already been attached to face each other are sequentially attached two by two so as to face each other in the circumferential direction. When the next new divided plate 3 is attached next to the existing new divided plate 3, the next new divided plate 3 is butt-joined to the existing new divided plate 3 by welding (vertical welding), and then the next The upper and lower sides of the new divided plate 3 are joined to the upper and lower body plate portions 1 of the cylindrical body plate portion 2 by welding (lateral welding). As a result, as shown in FIG. 40, the entire cylindrical body plate portion 2 becomes a new cylindrical body plate portion. The new major beam 12 is attached to the bolt bar when the new divided plate 3 of the major beam 12 attaching portion is attached.

  If the opening 6 is formed and the new dividing plate 3 is attached so that the portion to which the conventional (old) major beam 12 is attached is left to the end, the conventional major beam 12 is formed into a cylindrical body. Since it functions as a reinforcement member at the time of the update operation of the board part 2, it is preferable. Alternatively, the opening 6 is first formed in the portion where the conventional major beam 12 is attached and the new dividing plate 3 is attached, and the new major beam 12 is attached instead of the conventional major beam 12, and then the other openings are opened. 6 and attachment of the new dividing plate 3 are preferable because this new major beam 12 functions as a reinforcing member during the renewal work.

Here, the attachment method of the new division board 3 using the trolley beam 45 is demonstrated in detail.
As shown in FIGS. 41 and 42, a pair of gear trolleys 51 are provided on the trolley beam 45 so as to be horizontally movable, and a chain block 52 is attached to each gear trolley 51. And, for example, when attaching the next new divided plate 3 next to the existing new divided plate 3, by attaching the lift lug 27 provided on the outer surface of the new divided plate 3 to the chain block 52 in the trolley station, The new dividing plate 3 is held by the chain block 52, and then the gear trolley 51 that moves along the trolley beam 45, and the chain block 52 that can move the new dividing plate 3 up and down, the opening 6 of the cylindrical body portion 2 is formed. Move forward.

  The new divided plate 3 is provided with square plate-like temporary welding jigs 54 and 55. The tack welding jigs 54 are provided at the upper and lower ends of the outer surface of the new divided plate 3 and the side end portions on the existing new divided plate 3 side, and when the new divided plate 3 is fitted into the opening 6, The outer surface of the body plate 1 and the outer surface of the existing new divided plate 3 are brought into contact with each other to position the opening 6 in the inner and outer directions. The tack welding jig 55 is provided at the lower end of the inner surface of the new divided plate 3 and forms the lower side (lower side) of the opening 6 when the new divided plate 3 is fitted into the opening 6. In contact with the end face of the body plate 1, the opening 6 is positioned in the vertical direction with respect to the opening 6.

  As shown in FIG. 41, in order to fit the new divided plate 3 moving in front of the opening 6 into the opening 6, two lift lugs 27a and 27b provided above and below the inner surface of the new divided plate 3 are used. First, the lower lift lug 27 b is pulled toward the opening 6, and the temporary welding jig 55 is brought into contact with the end surface of the body plate 1 forming the lower side (lower side) of the opening 6. Next, the upper lift lug 27a is pulled toward the opening 6 and brought into contact with the outer surface of the body plate 1 and the outer surface of the existing new divided plate 3 as shown in FIG. In this way, after the new divided plate 3 is fitted into the opening 6 adjacent to the existing new divided plate 3, the upper and lower body plates of the cylindrical body plate portion 2 and the existing new divided plate 3 are formed. The new divided plate 3 is tack welded. Thereafter, the new divided plate 3 is attached to the opening 6 by regular welding.

  After the entire cylindrical body plate portion 2 is made a new cylindrical body plate portion by the new dividing plate 3, the trolley beam 45 and the cutting machine guide 46 (see FIG. 36) are removed, and then the trolley beam clip 42 and the cutting machine are removed. Remove the guide clip 41 (see FIG. 36). In addition, the moving lift lug 27 (see FIG. 31) and the nozzle deformation preventing member 29 (see FIG. 28) attached to the new divided plate 3 are removed.

Next, as shown in FIGS. 43 and 44, the notch member 23a of the tray support ring is attached to the connecting portion between the new divided plate 3 and the new divided plate 3 by welding.
In this way, after the cylindrical body plate portion 2 is made a new cylindrical body plate portion, the tray is assembled.
Next, the temporarily removed faulty piping and external parts are returned to their original positions.
Next, a heat insulating material is provided around the new cylindrical body plate portion.
The scaffold is then removed.

  In the above-described example, the trolley beam 45 can be provided on a part of the cylindrical body plate portion 2 in the circumferential direction. For example, when other equipment is approaching the periphery of the cylindrical body plate portion 2 and the circumferential range in which the crane or the like cannot be used is about 2/3 of the entire circumference, this range and the trolley beam 45 May be provided.

  In the above-described example, the entrance / exit 4 is provided and the internal parts in the tower are carried out to the outside. However, the internal parts may be carried out from the opening 6 without providing the entrance / exit. .

JP 2009-209649 A

  By the way, in such a partial renewal method for the trunk plates of tower tanks, it is desired to further shorten the construction period and shorten the operation stop period of the entire equipment.

  The present invention has been made in view of the above circumstances, and it is possible to efficiently perform the renewal work while maintaining the necessary strength, and to partially update the trunk plate of the tower tanks that can shorten the construction period. The purpose is to provide a method of construction.

In order to achieve the above object, a method of renewing a cylindrical body part of a part of a body plate of tower tanks,
The cylindrical body plate part is obtained by repeatedly cutting and removing the cylindrical body plate part to be renewed into a circular arc plate having a square shape in the circumferential direction, and attaching a new partial body plate to the resulting opening. Is a method of updating
A reinforcing member is attached to the lateral side of the opening on the outer surface of the barrel plate by welding before the cylindrical barrel plate portion is partially cut and removed in the circumferential direction to form the square arc plate-shaped opening. The upper and lower reinforcing plates fixed by welding near the diagonally outer sides of the upper and lower corners of the opening, and both ends fixed to the upper surfaces of these upper and lower reinforcing plates by welding. A vertical member extending in the vertical direction fixed to the body plate by welding;
Then, only the vertical member of the reinforcing member is removed, leaving the reinforcing plate,
It is characterized by that.

  In the present invention, before forming the rectangular arc plate-shaped opening by partially cutting and removing the cylindrical body plate portion in the circumferential direction, a reinforcing member is welded to the lateral side of the opening on the outer surface of the body plate. Therefore, even when the opening is formed, the strength against buckling of the cylindrical body plate portion can be ensured. In particular, in the present invention, the reinforcing member is welded to the upper and lower reinforcing plates fixed by welding in the vicinity of the diagonally outer sides of the upper and lower corners of the square arc plate-like opening, and the upper surfaces of these upper and lower reinforcing plates. Since both ends are fixed by the vertical member extending in the vertical direction and fixed to the body plate by welding, the corners of the opening where the load concentrates can be reinforced by the upper and lower reinforcing plates, so that a large opening can be formed. it can. Therefore, in the present invention, it is possible to efficiently perform the renewal work while maintaining the required strength, it is possible to shorten the construction period, thereby shortening the operation stop period of the entire equipment, and accompanying the operation stop Loss can be reduced.

In addition, the vertical member of the reinforcing member is removed, leaving a thin reinforcing plate, so there is no effect on weight increase or heat retention, and the work of removing this reinforcing plate can be omitted. Construction time can be shortened.
In addition, since both ends of the vertical member extending in the vertical direction are fixed to the upper surface of the upper and lower reinforcing plates by welding, when the vertical member is removed from the upper surface of the reinforcing plate, the lower body plate of the reinforcing plate may be damaged. Absent.

In the above-mentioned configuration of the present invention, in the step of cutting the upper and lower portions of the vertical member in the vicinity of the reinforcing plate, respectively, and forming the opening, including the portion of the vertical member inside these upper and lower cutting locations, It is preferable that the cylindrical body plate portion to be updated is partially cut and removed into a circular arc plate shape in the circumferential direction.
In this way, since most of the vertical member can be removed together with the part of the body plate that is cut and removed, the majority of the vertical member can be removed without removing it from the body plate, thereby shortening the construction time. be able to.

In addition, it is preferable to provide the notch for providing a clearance gap between the said vertical member and the said cylindrical trunk | drum board part in the cutting position of the said vertical member.
If it does in this way, the part removed with a trunk plate at the time of opening can be easily isolate | separated from the part by the side of a reinforcement board, without damaging a cylindrical trunk | drum board part only by cut | disconnecting a vertical member.

Further, in the above configuration of the present invention, a panel reinforcing member extending in the vertical direction is attached to the outer surface of the new partial body plate by welding in advance, and after all the new partial body plates are attached, It is preferred to remove all or most of it.
In this way, when the new partial body plate is attached, even if the opening is formed next to the new partial body plate, instead of the reinforcing member or together with the reinforcing member, against the buckling of the cylindrical body plate portion Strength can be secured. Therefore, a large opening can be formed.

Moreover, the said structure of this invention WHEREIN: It is preferable that the said new partial trunk | drum is obtained when the said cylindrical trunk | drum board part is substantially equally divided | segmented into multiple pieces in the circumferential direction.
Here, the reason why the partial body plate is divided substantially equally is that the new partial body plate is obtained when the cylindrical body plate portion is basically divided equally in the circumferential direction, but the members such as nozzles are divided. This is because it may be necessary to move the dividing portion (dividing line) slightly in the circumferential direction when positioned at a position.
If it does in this way, since a new partial body board can be made into the thing of substantially the same shape, manufacture and attachment work of a new partial body board can be made efficient.

Moreover, in the said structure of this invention, it cuts and removes two places which the circumferential direction opposing of the said cylindrical trunk | drum board part partially removes, and it repeats attaching the said new partial trunk | drum to each opening produced by removing. It is preferable.
If it does in this way, in the state where both opening produced, the balance of the section modulus in the peripheral direction of a cylindrical body board part is good, and it can be made stable in intensity.

  According to the partial renewal method for the trunk plate of the tower tanks of the present invention, the renewal work can be efficiently performed while maintaining the required strength, and the construction period can be shortened. The outage period can be shortened, and loss due to operation stop can be reduced.

It is a figure which shows the partial renewal construction method of the trunk | drum of the main distillation tower which concerns on embodiment of this invention, Comprising: It is a cross-sectional view which shows the cylindrical trunk | drum board part of the state which attached the new division board. It is a front view of the new division board which attached the panel reinforcement member equally. It is sectional drawing which follows the AA line of FIG. It is a side view of the new division board for demonstrating the cutting position of a panel reinforcement member equally. It is sectional drawing which follows the BB line of FIG. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of the state which attached the reinforcement member equally. It is a front view which shows the state which attached the upper and lower reinforcement board of the reinforcement member to the trunk | drum similarly. It is a front view which shows the state which attached the vertical member of the reinforcement member to the trunk | drum similarly. It is sectional drawing which follows the CC line of FIG. FIG. 9 is a view taken in the direction of arrow D in FIG. 8. It is a side view of the reinforcement member part for demonstrating the cutting method of the vertical member of a reinforcement member equally. It is an enlarged view of the principal part of FIG. It is a side view of the reinforcement member part of the state which removed the up-and-down edge part of the vertical member of the reinforcement member equally. FIG. 6 is a front view of the reinforcing member portion for explaining that the vertical member portion of the reinforcing member is removed together with the formation of the opening 6. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of the same first opening formation process state. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of a first new division board attachment process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of a 2nd opening formation process state similarly. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of a 2nd new division board attachment process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of a 3rd opening formation process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of a 3rd novel division board attachment process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of the last opening formation process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of the last new division board attachment process state same as the above. It is a figure which expand | deploys and shows the outer surface of the cylindrical part of the state which removed the panel reinforcement member similarly. It is a figure which expand | deploys and shows the outer surface of the cylindrical part after an update similarly. It is a figure which shows the example of the partial renewal construction method of the trunk | drum of a main distillation tower, Comprising: It is sectional drawing which shows the renewal range of a cylindrical trunk | drum board part. It is a figure which shows the work process in a factory, Comprising: It is a perspective view which shows the new division board manufactured in a factory. It is a figure showing the example of parts manufactured in a factory, (a) is a figure of a nozzle, (b) is a figure of a manhole, (c) is a figure showing an internal part for trays, ( d) is a diagram showing a new external part for mounting. It is a perspective view which shows the new division board with a nozzle manufactured in a factory similarly. It is a perspective view which shows the state which assembled the new division board and temporarily fixed and welded. It is a perspective view which shows the state which performed the marking on the new division board temporarily fixed to the same cylindrical shape. It is a perspective view which shows the state which attached the internal component and the external component to the new division board temporarily fixed to the cylinder shape. It is a partial cross-sectional view which shows the connection part of a new division board equally. It is a perspective view which shows the state which decomposed | disassembled the new divided plate temporarily fixed to the cylindrical shape into the single new divided plate. It is a figure which shows the work process in a construction site, Comprising: It is sectional drawing which shows the state which provided the entrance / exit in the cylindrical trunk | drum board part. It is a front view which shows the state which attached the scoring and cutting machine guide clip, and the trolley beam attachment clip. It is a perspective view which shows the state which cut | disconnected the upper and lower sides of the cylindrical trunk | drum board part in circular arc shape, in order to form the opening which attaches a trolley beam, a cutting machine guide, and a new division board. FIG. 6 is a plan view showing a state in which the upper and lower portions of the cylindrical body plate are cut into a circular arc plate to form an opening for attaching the new divided plate, and the order of attaching the new divided plate. It is a perspective view which shows the state which formed the opening which attaches a new division board in the two places which the circumferential direction of a cylindrical trunk | drum board opposes. It is a perspective view which shows the state which attaches a new division board to opening similarly. FIG. 6 is a perspective view showing a state where the entire cylindrical body plate portion is a new cylindrical body plate portion. It is a side view which shows the attachment method of the new division board using the trolley beam. It is a front view which shows the attachment method of the new division board using a trolley beam. It is a schematic plan view which shows the state which attaches the notch member of a tray support ring to the connection part of a new division plate and a new division plate. It is a perspective view of the principal part which shows the state which attached the notch member of the tray support ring to the connection part of a new division plate and a new division plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the present invention is applied to a case where the body plate of the main distillation column of the atmospheric distillation apparatus of the oil refinery apparatus or the vacuum distillation apparatus is partially updated.
In the following, the same components as those shown in FIGS. 25 to 44 are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

  In the partial renewal method for the main plate of the main distillation tower according to this embodiment, first, a portion that has been thinned due to corrosion or the like of the main plate is investigated, and the range to be updated is determined. The main distillation column of the present embodiment is a large column (distillation column) having a cylindrical cross-sectional shape, and the diameter of the body plate of the trunk is about 4 to 10 m. And the cylindrical trunk | drum board part 2 of a part of intermediate part of the up-down direction among the trunk | drum 1 of the main distillation tower is changed into a new thing. In this example, the cylindrical body plate portion 2 to be updated has a dimension of about 3 to 6 m, for example.

  In the partial renewal method for the main plate of the main distillation tower, as shown in FIG. 1, the divided plate 3 having a shape obtained when the cylindrical body plate portion 2 is equally divided into a plurality of portions in the circumferential direction. The cylindrical body plate portion is repeatedly produced by repeatedly fitting and welding the new divided plate 3 to the opening formed by partially punching the cylindrical body plate portion 2 in the circumferential direction. 2 is changed to a new cylindrical body part.

  In more detail, in the partial renewal method of the main plate of the main distillation column, the two circumferentially opposed portions of the cylindrical main plate portion 2 are partially cut and removed, and the respective openings formed by removing are respectively removed. The new divided plate 3 is attached, and then two opposing portions of the adjacent portion of each attached new divided plate 3 are partially cut and removed, and the new divided plate 3 is repeatedly attached to each opening generated by the removal. Thus, the cylindrical body plate portion 2 is changed to a new cylindrical body plate portion. Specifically, in FIG. 1, two opposing positions are sequentially opened counterclockwise in plan view, and new divided plates 3 are sequentially attached.

The new divided plate 3 is manufactured in advance in a factory and transported to the site.
Here, the manufacturing method of the new division board 3 is demonstrated.
In addition, before manufacturing work in this factory, of course, it is necessary to grasp the dimensions and conditions of each part including the cylindrical body plate part 2 of the main distillation tower for manufacturing new divided plates and the like. is there.
First, as shown in FIG. 1, the new divided plate (new partial body plate) 3 is obtained when the cylindrical body plate part 2 to be updated is equally divided into a plurality (eight in this example) in the circumferential direction. A square arc plate shape (a square plate shape in a front view and an arc plate shape in a plan view). The new divided plate 3 is manufactured by cutting a rectangular plate material having a predetermined size and then bending it into a predetermined arc surface. A groove for welding is applied to the outer periphery of the four sides of the new divided plate 3.

A panel reinforcing member 100 extending in the vertical direction is attached to the outer surface of the new divided plate 3 by welding. For this panel reinforcing member 100, a grooved steel is used in this example, but a steel other than the grooved steel or other steel materials can be used. In this example, channel steel is used first. Each new split plates ₃ attached _{(3A 1,} 3B 1), mounting the panel reinforcement member 100, 100 at both end portions of the outer surface of the circumferential direction (lateral direction). Further, in the circumferential direction (left-right direction) of the outer surface of the new divided plate ₃ , the rear side of the mounting execution order of the new divided plates 3A ₂ , 3A ₃ , 3B ₂ , 3B ₃ attached to the second step and the third step (first step) In FIG. 1, the panel reinforcing member 100 is attached to the end of the counterclockwise direction indicated by the arrow. Moreover, the panel reinforcement member 100 does not need to be attached to the new divided plates 3A ₄ and 3B ₄ attached in the fourth step (the last step).

  As shown in FIG. 2 and FIG. 3, this panel reinforcing member 100 is attached to the new divided plate 3 by performing welding 102 by continuous welding over the entire circumference of the portion of the panel reinforcing member 100 that contacts the outer surface of the new divided plate 3. Install. The panel reinforcing member 100 is attached to the new divided plate 3 with a little space from the upper and lower ends of the new divided plate 3.

  As shown in FIG. 5, the panel reinforcing member 100 is cut along the longitudinal direction of the panel reinforcing member 100 as shown in FIG. The new divided plate 3 is removed from the outer surface leaving about 10 to 30 mm.

  In addition to the new dividing plate 3, nozzles, manholes, internal parts for trays (support ring, clamp bar, bolt bar, footrest, etc.), and external parts for new mounting (moving lift lugs, landing / ladder clips, etc.) Is produced. In the case of a new divided plate with a nozzle, a nozzle is welded to the new divided plate and the welded portion is inspected. In the vicinity of the nozzle, a nozzle deformation preventing member for preventing the nozzle from being deformed or damaged by contact with another member or the like is attached in advance.

Next, eight new divided plates 3 are assembled into a cylindrical shape and temporarily fixed.
Next, the inner part and the outer part are attached. It should be noted that a component (for example, a tray support ring) is not attached to the connection portion of each new divided plate 3 and is attached on site.
Then, when the attachment of the inner and outer parts is completed, the temporary welding is removed and the single divided plate 3 is disassembled. Then, these new division boards 3 are conveyed to a construction site.

  Next, a method for updating the cylindrical body plate portion 2 in the field will be described with reference to FIGS. 6 and FIGS. 15 to 24 are developed views of the outer surface of the cylindrical portion 2 and show the outer surface of the body plate 1 including the cylindrical portion 2. In these drawings, the leftmost reinforcing member is the same as the rightmost reinforcing member.

In the partial renewal method of the main plate of the main distillation column according to this embodiment, first, as shown in FIG. 6, on the lateral side of the outer surface of the main plate 1 at the joining position of the new divided plates 3 to be attached, The reinforcing member 200 is attached by welding. Specifically, the new split plates 3A ₁ of the eight new division plate 3 attached schedule, the _{3A 2, 3A 3, 3B 1} , 3B 2, 3B 3, after mounting the enforcement order of the new division plates 3 A reinforcing member 200 is attached to the outer surface of the outer body plate 1 on the side (counterclockwise front side indicated by an arrow in FIG. 1; right side in FIG. 6), and the new divided plates 3A ₄ and 3B ₄ The reinforcing member 200 is attached to the outer surface of the body plate 1 on the inner side of the rear side of the attachment execution order of each new divided plate 3 (the counterclockwise front side indicated by the arrow in FIG. 1; the right side in FIG. 6). Thus, the outer surface of the new division plate 3A _1, cylinder plate 1 position 3B ₁ of the eight new division plate 3 attached schedule, the reinforcing member 200 is not provided. In addition, the new division plate _{3A 2,} 3A _3, 3B 2, the outer surface of the shell plate 1 position 3B ₃ mounting scheduled, the front side (first view of the mounting enforcement order of the new division plates 3, indicated by arrow A reinforcing member 200 is provided at an end on the counterclockwise rear side (left side in FIG. 6). Further, on the outer surface of the body plate 1 at the positions of the new divided plates 3A ₄ and 3B ₄ to be attached, the reinforcing members 200 are respectively provided at the front and rear end portions of the mounting order of the new divided plates 3. .

  The reinforcing member 200 includes upper and lower reinforcing plates 202 fixed by welding so as to be positioned in the vicinity of diagonally outer sides of the upper and lower corners of the opening 6 when the openings 6 are sequentially formed, and upper surfaces of the upper and lower reinforcing plates 202. And a vertical member 204 extending in the vertical direction and fixed to the body plate 1 by welding.

More specifically, for example, in FIG. 6, a reinforcing member 200 provided on the outer surface of the body plate 1 on the left side of the new divided plate 3A ₁ to be attached (that is, the new divided plate 3B _{4 to} be attached In order to attach the reinforcing member 200 provided at the rear end of the attaching order of the divided plates 3, first, as shown in FIG. 7, the upper and lower corners on the left side of the position of the new divided plate 3 A _{1 to} be attached are shown. A rectangular plate-like reinforcing plate 202 is attached to the outer surface of the body plate 1 by welding 206 by continuous welding so that the center line in the left-right direction passes near the corner of the opening in the vicinity of the diagonally outer side. For example, a rectangular plate having a length and width of about 300 mm × 300 mm and a thickness of about 9 to 19 mm can be used as the reinforcing plate 202. Thereafter, as shown in FIGS. 8 and 9, the upper and lower ends of the vertical member 204 are fixed to the upper surfaces of the upper and lower reinforcing plates 202 by continuous welding 206, and the portions between the upper and lower ends are The vertical member 204 is attached to the outer surface of the body plate 1 on the left side of the position of the new divided plate 3A _{1 to} be attached by being fixed to the plate 1 by performing welding 208 by continuous welding or intermittent welding. . In FIG. 8, the vertical weld line between the new divided plate 3 </ b> A ₁ and the new divided plate 3 </ b> B ₄ is located on the right side of the center line in the left-right direction of the upper and lower reinforcing plates 202, and the upper and lower reinforcing plates 202. The vertical member 204 is positioned on a substantially center line in the left-right direction. However, as shown in FIG. 6, when the vertical weld line between the new divided plate 3A ₁ and the new divided plate 3B ₄ is located on the right side of the horizontal center line of the upper and lower reinforcing plates 202, The vertical member 204 is preferably located on the left side of the upper and lower reinforcing plates 202 opposite to the left-right direction. This fixed position of the vertical member 204 with respect to the upper and lower reinforcing plates 202 is determined by the number of divisions of the new divided plate 3 and the update order. In the case of the present embodiment, as shown in FIG. 6, the vertical member 204 is fixed to the upper and lower reinforcing plates 202. Although the L-shaped steel is used for the vertical member 204 in this example, a shape steel other than the L-shaped steel or other steel materials can be used. Note that at least a part of the upper and lower reinforcing plates 202 is positioned on the extension of the vertical weld line between the new divided plates 3 (therefore, the vertical cutting line of the opening 6).

  As shown in FIG. 10, the thickness of the reinforcing plate 202 is prevented at the upper and lower end portions of the vertical member 204 in order to prevent the vertical member 204 from floating (becomes higher) than other portions when fixed to the upper surface of the reinforcing plate 202. A notch 302 corresponding to is provided.

The vertical member 204 is removed as follows when the opening 6 is formed in a later process.
As shown in FIGS. 11 and 12, first, before the opening 6 is formed, the vertical member 204 is placed at a position slightly inside the upper and lower ends of the new divided plate 3A _{1 to} be attached. Notches 304 and 304 for providing a gap between the cylindrical body plate portion 2 (body plate 1) are provided. These notches 304 and 304 are provided in advance when the vertical member 204 is manufactured at the factory. Thereafter, each notch 304 portion of the vertical member 204 is cut from the tip to the notch 304, and the upper and lower ends of the vertical member 204 are cut off.

Thereafter, as shown in FIG. 13, the upper and lower ends of the vertical member 204 are removed by scraping the welded portions 206 between the upper and lower ends and the upper and lower reinforcing plates 202, 202 with a grinder or the like.
Thereafter, as shown in FIG. 14, the body plate 1 is partially cut into a square arc plate shape to form the opening 6, thereby removing the notch 304 attached to the outer surface of the body plate 1. The portion of the longitudinal member 204 between the notch 304 is removed together.
The upper and lower reinforcing plates 202 and 202 are left as they are on the outer surface of the trunk plate 1.

Next, as illustrated in FIG. 15, openings 6 and 6 are formed in two portions of the cylindrical body plate portion 2 that are opposed in the circumferential direction (positioned as point objects in plan view). That is, the openings 6 and 6 for attaching the new divided plates 3A ₁ and 3B ₁ are formed. The circumferential length of the openings 6 and 6 is determined so that the new divided plates 3A ₁ , 3B ₁ can be easily attached and the next divided plates 3A ₁ , 3B ₁ can be easily formed. it may be set slightly longer on both sides than the width of 3B _1. Reinforcing members 200 and 200 are respectively arranged on both outer sides of the openings 6 and 6 in the circumferential direction, thereby preventing buckling of the openings 6 and 6. Furthermore, the four corners of the opening 6 where the load is concentrated can be reinforced by the upper, lower, left and right reinforcing plates 202.

Next, as shown in FIG. 16, new divided plates 3 </ b> A ₁ and 3 </ b> B ₁ are attached to the openings 6 and 6 formed facing the circumferential direction of the cylindrical body plate portion 2, respectively. That is, the new divided plates 3A ₁ and 3B ₁ are fitted into predetermined positions of the openings 6 and 6, and the upper and lower sides of the new divided plates 3A ₁ and 3B ₁ are fixed to the upper and lower body plates 1 of the cylindrical body plate portion 2 by welding. .

Next, as shown in FIG. 17, openings 6 and 6 for attaching the new divided plates 3A ₂ and 3B ₂ are formed next to the new divided plates 3A ₁ and 3B ₁ so as to face each other in the circumferential direction. . At this time, each vertical member 204 provided with the new divided plates 3A ₂ and 3B ₂ at the position where the new divided plates 3A ₂ and 3B ₂ are to be attached is also removed. A panel reinforcing member 100 on the right side of each of the new divided plates 3A ₁ and 3B ₁ is disposed on the outer left side in the circumferential direction of each opening 6 and 6, and on the outer side on the right side in the circumferential direction of each opening 6 and 6, respectively. Reinforcing members 200 are respectively disposed, thereby preventing buckling of the openings 6 and 6. Note that the upper and lower corners on the left side of the opening 6 where the load concentrates can also be reinforced by the reinforcing plates 202 remaining obliquely outside the corners.

Next, as shown in FIG. 18, new divided plates 3A ₂ and 3B ₂ are attached to the openings 6 and 6, respectively. That is, the new divided plates 3A ₂ and 3B ₂ are fitted into predetermined positions of the openings 6 and 6, and are joined to the new divided plates 3A ₁ and 3B ₁ by welding (longitudinal welding), and then the new divided plates 3A _{2 are} joined. , 3B ₂ are fixed to the upper and lower shell plates 1 of the cylindrical shell plate portion 2 by welding.

Next, as shown in FIG. 19, openings 6 and 6 for attaching the new divided plates 3A ₃ and 3B ₃ are formed next to the new divided plates 3A ₂ and 3B ₂ so as to face each other in the circumferential direction. . At this time, the vertical members 204 provided at the positions where the new divided plates 3A ₃ and 3B ₃ are to be attached are also removed. A panel reinforcing member 100 provided on the right side of each of the new divided plates 3A ₂ and 3B ₂ is disposed outside the left side in the circumferential direction of each opening 6 and 6, and the right side in the circumferential direction of each opening 6 and 6 Reinforcing members 200 are respectively disposed on the outer sides of the first and second openings, thereby preventing the openings 6 and 6 from buckling. Note that the upper and lower corners on the left side of the opening 6 where the load concentrates can also be reinforced by the reinforcing plates 202 remaining obliquely outside the corners.

Next, as shown in FIG. 20, new divided plates 3A ₃ and 3B ₃ are attached to the openings 6 and 6, respectively. That is, the new divided plates 3A ₃ and 3B ₃ are fitted into predetermined positions of the openings 6 and 6, and butt-joined to the new divided plates 3A ₂ and 3B ₂ by welding (longitudinal welding), respectively, and then the new divided plates 3A ₃ 3B ₃ is fixed to the upper and lower body plates 1 of the cylindrical body plate portion 2 by welding.

Next, as shown in FIG. 21, openings 6 and 6 for attaching the new divided plates 3A ₄ and 3B ₄ are formed next to the new divided plates 3A ₃ and 3B ₃ so as to face each other in the circumferential direction. . In this case, the longitudinal members 204, 204 of the left and right which provided a new split plates _3A 4, 3B ₄ to the mounting scheduled position is also eliminated. The lengths of these openings 6 and 6 in the circumferential direction are set to the same length as the widths of the new divided plates 3A ₄ and 3B ₄ . A panel reinforcing member 100 provided on the right side of each of the new divided plates 3A ₃ , 3B ₃ is disposed outside the left side in the circumferential direction of each opening 6, 6, and the right side in the circumferential direction of each opening 6, 6. The panel reinforcing members 100 on the left side of the new divided plates 3A ₁ , 3B ₁ are disposed outside each of the openings 6 and 6, thereby preventing the openings 6 and 6 from buckling. It should be noted that the four corners on the top, bottom, left, and right of the opening 6 where the load concentrates can also be reinforced by the reinforcing plates 202 remaining in the vicinity of the diagonally outer sides of these corners.

Next, as shown in FIG. 22, new divided plates 3A ₄ and 3B ₄ are attached to the openings 6 and 6, respectively. That is, the new divided plates 3A ₄ , 3B ₄ are fitted into predetermined positions of the openings 6 and 6, and are butt-welded to the new divided plates 3A ₃ , 3B ₃ and the new divided plates 3A ₁ , 3B ₁ respectively by welding (vertical welding). Then, the upper and lower sides of the new divided plates 3A ₄ and 3B ₄ are fixed to the upper and lower shell plates 1 of the cylindrical shell plate portion 2 by welding.

Next, as shown in FIG. 23, the panel reinforcing member 100 provided on the outer surface of the new divided plates 3A ₁ , 3A ₂ , 3A ₃ , 3B ₁ , 3B ₂ , 3B ₃ is replaced with the new divided plates 3A ₁ , 3A _2. Remove about 10 to 30 mm from the outer surface of 3A ₃ , 3B ₁ , 3B ₂ , 3B ₃ (see FIG. 5).
In this way, as shown in FIG. 24, the entire cylindrical body plate portion 2 is a new cylinder made up of new divided plates 3A ₁ , 3A ₂ , 3A ₃ , 3A ₄ , 3B ₁ , 3B ₂ , 3B ₃ , 3B _4. It is considered as a cylindrical body part.

In the partial renewal method of the main plate of such a main distillation tower, before the cylindrical circular plate portion 2 is partially cut and removed in the circumferential direction to form the square arc plate-shaped opening 6, Since the reinforcing member 200 is attached by welding to the lateral side of the opening 6 on the outer surface of the body plate 1 to reinforce, it is possible to ensure the strength against the buckling of the cylindrical body plate portion 2 even when the opening 6 is formed. it can.
Furthermore, the reinforcing member 200 is fixed to the upper and lower corners of the upper and lower corners of the square arc plate-like opening 6 by welding, and upper and lower reinforcing plates 202 and 202, and upper surfaces of these upper and lower reinforcing plates 202 and 202, respectively. Since both ends are fixed to each other by welding and the vertically extending vertical member 204 is fixed to the body plate 1 by welding, the corners of the opening 6 where the load concentrates can be reinforced by the upper and lower reinforcing plates 202, 202. A large opening 6 can be formed. For example, in this example, the cylindrical body plate part 2 to be updated has a diameter of about 4 to 10 m and a vertical height of about 3 to 6 m. The two openings 6 and 6 are formed four times, and the new divided plate 3 is attached to each opening 6. Therefore, it is possible to efficiently perform the renewal work while maintaining the required strength, shorten the construction period, thereby shortening the operation stop period of the entire equipment, and reducing the loss due to the operation stop. Can do.

Further, the vertical member 204 of the reinforcing member 200 is removed to leave the thin reinforcing plate 202, so that there is no effect on the weight increase or the heat retention, and the work of removing the reinforcing plate 202 is omitted. And the construction time can be shortened.
Also, since both ends of the vertical member 204 extending in the vertical direction are fixed to the upper surfaces of the upper and lower reinforcing plates 202 and 202 by welding, when the vertical member 204 is removed from the upper surface of the reinforcing plate 202, the lower side of the reinforcing plate 202 The body plate 1 is not damaged.

  Also, in the step of cutting the upper and lower reinforcing plates 202 and 202 in the vicinity of the vertical member 204 of the reinforcing member 200 and forming the opening 6, the vertical member 204 inside the upper and lower cut portions is included. Since the cylindrical body plate portion 2 to be updated is partially cut and removed into a circular arc plate shape in the circumferential direction, most of the longitudinal member 204 is removed together with the portion of the body plate 1 to be cut and removed. Therefore, most of the vertical member 204 can be removed without removing it from the body plate 1, and the construction time can be shortened.

  Further, since the notch 304 for providing a gap between the vertical member 204 and the cylindrical body plate portion 2 is provided at the cutting position of the vertical member 204, the cylindrical body plate can be obtained simply by cutting the vertical member 204. Without damaging the portion 2, the portion removed together with the body plate 1 at the time of opening can be easily separated from the portions on the reinforcing plates 202 and 202 side.

  In addition, the panel reinforcing member 100 extending in the vertical direction is attached to the outer surface of the new divided plate 3 by welding in advance, and after attaching all the new divided plates 3, most of each panel reinforcing member 100 is removed. When the divided plate 3 is attached, even if the opening 6 is formed next to the new divided plate 3, the strength against the buckling of the cylindrical body plate portion 2 is secured instead of the longitudinal member 204 of the removed reinforcing member 200. can do. Therefore, a large opening 6 can be formed.

  Further, since the new divided plate 3 is obtained when the cylindrical body plate portion 2 is divided substantially equally into a plurality of portions in the circumferential direction, the new divided plate 3 can be formed to have substantially the same shape. Therefore, it is possible to make the production and attachment work of the new divided plate 3 efficient.

  Furthermore, since two circumferentially opposed two portions of the cylindrical body plate portion 2 are partially cut and removed, and the new divided plates 3 and 3 are respectively attached to the openings 6 and 6 generated by the removal, both In the state where the openings 6 and 6 are generated, the balance of the section modulus in the circumferential direction of the cylindrical body plate portion 2 is good, and the strength can be stabilized.

  In addition, when the progress of corrosion of the cylindrical body part 2 to be renewed is severe and the thinning is remarkable, as the reinforcing member, for example, before removing the cut body part from the cylindrical body part 2, the cylindrical body A deformation preventing reinforcement member may be further attached to the outer surfaces of the upper and lower body plates 1 in the vicinity of the plate portion 2 by welding over the entire circumference or in a partial range where deformation is expected. By providing the reinforcing member for preventing deformation, the cylindrical body plate portion 2 is removed when the cut body plate portion is removed from the cylindrical body plate portion 2 to form the opening 6 or when the new divided plate 3 is welded. It is possible to prevent the cross-sectional shape of the body plate 1 portion in the vicinity of from being deformed, and to maintain a cylindrical shape (perfect circle). The deformation preventing reinforcing member is removed from the body plate 1 after the cylindrical body plate portion 2 is made a new cylindrical member. The deformation preventing reinforcing member can be made of, for example, a shape steel such as a grooved steel or an H-shaped steel. The deformation preventing reinforcing member is wound around the entire outer periphery of the body plate 1 and fixed by welding or the like. The deformation preventing reinforcing member may be provided on one of the outer surfaces of the upper or lower body plate in the vicinity of the cylindrical body plate portion 2.

Moreover, in the above-mentioned example, it replaces with the new division board 3 for every two places where the circumferential direction of the cylindrical trunk | drum board part 2 opposes, However, instead of this, the circumferential direction of the cylindrical trunk | drum board part 2 It is also possible to repeatedly cut and remove two portions that are not opposed to each other and attach a new partial body plate (new divided plate) to each opening generated by the removal.
In addition, a plurality of three or more portions that are equally spaced in the circumferential direction of the cylindrical body plate portion 2 are cut and removed, and a new partial body plate is attached to each opening generated by the removal. Alternatively, it may be possible to repeatedly cut and remove a plurality of portions at three or more locations that are not evenly spaced, and repeatedly attach a new partial body plate to each opening generated by the removal.
Moreover, you may make it repeat repeating cutting and removing one part of the circumferential direction of the cylindrical trunk | drum board part 2, and attaching a new partial trunk | drum to the opening produced by removing.
As described above, when an opening is formed in one or a plurality of portions in the circumferential direction of the cylindrical body part 2, the cylindrical body part 2 is deformed or damaged when the opening is formed. The number, position, and size of the opening are determined so that the strength can be maintained.

  In the above-described example, the new divided plate 3 is formed as a partial body plate having a shape obtained when the cylindrical body plate portion 2 is equally divided into a plurality of portions in the circumferential direction. You may form as a some partial body board from which the dimension of the circumferential direction differs, without dividing | segmenting into. The partial body plate is preferably one obtained by dividing the cylindrical body plate portion 2 into at least four pieces in the circumferential direction.

  In the above-described example, the opening 6 is formed next to the already-attached new dividing plate 3 and the next new dividing plate 3 is attached. Instead, the already-attached new dividing plate 3 is attached. An opening 6 may be formed at a distance from 3 and a new dividing plate 3 may be attached.

  In the embodiment described above, the circumferential dimension of the opening 6 to be formed may be set to be larger than the circumferential dimension of the new divided plate 3 to be attached. You may make it attach.

  In the above example, the material of the new divided plate 3 is the same as that of the cylindrical body plate portion 2, but other materials may be used for the new divided plate 3, or the new divided plate. Corrosion resistance and the like may be improved by using clad steel for 3 or lining the inner surface of the new divided plate 3.

Moreover, the vertical member 204 of the reinforcing member 200 may extend not only in the vertical direction but also in an oblique direction, or a plurality of the vertical members 204 may be provided.
In addition, the panel reinforcing member 100 may extend not only in the vertical direction but also in an oblique direction, or a plurality of panel reinforcing members 100 may be provided, or a plurality of members extending in the vertical direction may be joined by welding. It may be fixed.
Further, the mounting position / number / size of the reinforcing member 200 and the mounting position / number / size of the panel reinforcing member are determined in accordance with the size / number / opening order of the openings.

  In the above-described embodiment, the present invention is applied to a case where the main plate of the main distillation column is partially updated. However, the present invention is not limited to this and is also applied to other vertical towers or tanks. be able to.

  Moreover, after updating the cylindrical trunk | drum part of one part of the trunk | drum of one tower tank using the present invention, it is of course possible to update the cylindrical trunk | drum part of another part.

1 Body plate 2 Cylindrical body plate part 3 New divided plate (new partial body plate)
6 Opening 100 Panel reinforcing member 200 Reinforcing member 202 Reinforcing plate 204 Vertical member 304 Notch

Claims (6)

A method of renewing a cylindrical shell plate portion of a part of a shell plate of a tower tank,
The cylindrical body plate part is obtained by repeatedly cutting and removing the cylindrical body plate part to be renewed into a circular arc plate having a square shape in the circumferential direction, and attaching a new partial body plate to the resulting opening. Is a method of updating
A reinforcing member is attached to the lateral side of the opening on the outer surface of the barrel plate by welding before the cylindrical barrel plate portion is partially cut and removed in the circumferential direction to form the square arc plate-shaped opening. The upper and lower reinforcing plates fixed by welding near the diagonally outer sides of the upper and lower corners of the opening, and both ends fixed to the upper surfaces of these upper and lower reinforcing plates by welding. A vertical member extending in the vertical direction fixed to the body plate by welding;
Then, only the vertical member of the reinforcing member is removed, leaving the reinforcing plate,
The partial renewal method of the trunk plate of tower tanks characterized by this. Cut the portions near the reinforcing plate above and below the vertical member,
In the step of forming the opening, the cylindrical body plate portion to be updated is partially cut into a circular arc plate shape in the circumferential direction, including the vertical member portion inside the upper and lower cutting portions. The partial renewal method of the trunk plate of tower tanks of Claim 1 characterized by removing.   The portion of the trunk plate of the tower tanks according to claim 2, wherein a notch for providing a gap between the vertical member and the cylindrical shell plate portion is provided at a cutting position of the vertical member. Renewal method.   A panel reinforcing member extending in the vertical direction is attached to the outer surface of the new partial body plate by welding in advance, and after all the new partial body plates are attached, all or most of the panel reinforcing members are removed. The partial renewal construction method of the trunk plate of tower tanks of any one of Claims 1-3.   The said new partial body board is obtained when the said cylindrical body board part is divided | segmented into the plurality of substantially equal parts in the circumferential direction, The any one of Claims 1-4 characterized by the above-mentioned. The partial renewal method of the shell plate of the tower tank described.   2. The method according to claim 1, wherein the two portions of the cylindrical body plate that are opposed to each other in the circumferential direction are partially cut and removed, and the new partial body plate is attached to each of the openings formed by the removal. The partial renewal construction method of the trunk plate of the tower tanks of any one of Claim 5.

Images