JP2011132805A - Partial renewal construction method of shell plate for towers and vessels - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a partial renewal construction method of a shell plate for towers and vessels, capable of partially renewing the shell plate for towers and vessels in a short period of time and at low construction cost. <P>SOLUTION: In the partial renewal construction method of a shell plate of a main distillation tower, a cylindrical shell plate part 2, which is part of the shell plate 1 of the main distillation tower, is renewed by repeating steps of partially cutting and removing two circumferentially facing areas of the cylindrical shell plate part 2 and attaching a new partition plate 3 to each of openings 6 formed by the removal of the two areas. The cylindrical shell plate portion to be renewed is set to a height range of 3-4 m. The new partition plate 3 can be obtained when the cylindrical shell plate part 2 is equally divided into a plurality of numbers in the circumferential direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 whole 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 and thinned portion of the body plate 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.
In addition, the metal spraying method has a problem that it is an emergency treatment, is not suitable when the construction range is wide, or the sprayed coating may be peeled off due to a corrosive environment.

  The present invention has been made in view of the above circumstances, and a partial renewal method for a trunk plate of a tower tank that can partially renew a tower plate of a tower tank with a short construction period and at a low construction cost. The purpose is to provide.

In order to achieve the object, the partial renewal method of the tower slab body plate according to claim 1 is a method of renewing a cylindrical body part of a part of the tower slab body plate. It is a method of renewing the cylindrical body plate part by repeatedly cutting and removing the cylindrical body plate part in the circumferential direction, and repeatedly attaching a new partial body plate to the resulting opening. The cylindrical body plate portion is set to a height range of 3 to 4 m .

In the first aspect of the invention, the cylindrical body plate portion to be renewed is partially cut and removed in the circumferential direction, and a new partial body plate (new partial body plate) is repeatedly attached to the opening formed by the removal. Thus, since the cylindrical body plate portion is renewed in a height range of 3 to 4 m, the cylindrical body plate portion can be renewed in a short construction period and at a low construction cost. That is, the cylindrical body plate part to be renewed is replaced with a new partial body plate partly one after another in the circumferential direction, so that it becomes a new cylindrical body plate part. There is no need to remove it, and the renewal work can be performed with the towers standing at the site, so that the construction period can be shortened and the construction cost can be reduced. In particular, the fact that the construction period can be shortened can shorten the operation stop period of the entire facility and can reduce the loss due to the operation stop. In addition, since the cylindrical body plate part is renewed by removing a part of the cylindrical body plate part and attaching a new part body plate, the handling members are not large, so the handling space is small and the construction space is small. In addition, the number of workers to be mobilized can be reduced, and the construction safety can be improved. In addition, unlike repairs such as the lining method and metal spraying method, it is a method that replaces the portion where the body plate is corroded and thinned with a new member, so the mechanical strength of the towers can be restored, Its lifetime can be greatly extended.

The partial renewal method of the trunk plate of the tower tanks according to claim 2 is the invention according to claim 1, wherein the new partial trunk plate is substantially evenly divided into a plurality of the cylindrical trunk plate portions in the circumferential direction. It is obtained when divided.
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.

  In the invention according to the second aspect, since the new partial body plate can have substantially the same shape, the production and attachment work of the new partial body plate can be made efficient.

  The partial renewal method of the trunk plate of the tower tanks according to claim 3 is the invention according to claim 1 or claim 2, wherein two portions of the cylindrical trunk plate portion facing each other in the circumferential direction are partially cut. It is characterized by repeating the step of removing and attaching the new partial body plate to each opening produced by the removal.

  In the invention according to claim 3, because it repeats to cut and remove the two portions facing each other in the circumferential direction of the cylindrical body plate portion, and to attach a new partial body plate to each opening generated by the removal, In a state where both openings are generated, the balance of the section modulus in the circumferential direction of the cylindrical body plate portion is good, and the strength can be stabilized.

  The partial renewal method of the trunk plate of the tower tanks according to claim 4 is the invention according to any one of claims 1 to 3, wherein the dimension of the opening in the circumferential direction is the same as that of the new partial shell plate to be attached. It is characterized by being larger than the circumferential dimension.

  In the invention described in claim 4, a gap is provided in the circumferential direction of the cylindrical body plate portion between the opening formed by removing a portion of the cylindrical body plate portion in the circumferential direction and the new partial body plate. Therefore, it is possible to insert a work tool such as a cord using the gap, to perform work, or to allow the worker to enter and exit the trunk plate through the gap, thereby improving workability.

  The partial renewal method of the trunk plate of the tower tanks according to claim 5 is the invention according to any one of claims 1 to 4, wherein the vicinity of the cylindrical trunk plate portion is formed before the opening is formed. A deformation preventing reinforcing member is attached over the entire circumference of the body plate.

  In the invention described in claim 5, since the deformation preventing reinforcing member is attached over the entire circumference of the body plate in the vicinity of the cylindrical body plate portion, the cylindrical body is renewed during the renewal operation of the cylindrical body plate portion. It can prevent that the cross-sectional shape of the trunk | drum board part of the vicinity of a board part deform | transforms.

  The partial renewal method of the trunk plate of the tower tanks according to claim 6 is the invention according to any one of claims 1 to 5, wherein the cylindrical trunk plate portion is renewed before the opening is formed. A partial reinforcing member is attached.

  In the invention described in claim 6, since the renewal portion reinforcing member is attached to the cylindrical body plate portion, the cylindrical body plate portion does not fall into a state of insufficient strength even when the strength of the cylindrical body plate portion is greatly reduced due to corrosion or the like. Part of the circumferential direction of the cylindrical body plate portion can be removed.

  The partial renewal method of the trunk plate of the tower tanks according to claim 7 is the invention according to any one of claims 1 to 6, so as to serve as a mark for cutting positioning for forming the opening. A hole is formed from the inside to the outside of the cylindrical body plate portion.

  In the invention described in claim 7, after a ruled line corresponding to the position of the inner part or the like is written inside the cylindrical body plate portion, an opening is formed outside the cylindrical cylindrical portion with the hole as a mark. A ruled line for cutting can be easily and accurately entered.

  The partial renewal method for the shell plate of the tower tanks according to claim 8 is the invention according to any one of claims 1 to 7, wherein the new partial shell plate is manufactured in a factory to form a new cylinder. It is characterized by being transported to the site where renewal work is performed after temporarily assembling and checking the cylindrical body plate portion.

  In the invention described in claim 8, it is possible to reduce the labor of the renewal work at the site and further shorten the construction period.

  The partial renewal method for the trunk plate of the tower tanks according to claim 9 is the invention according to any one of claims 1 to 8, wherein a trolley beam is provided along a circumferential direction of the cylindrical trunk plate portion. The trolley beam is used to move a member such as the new partial body plate in the circumferential direction of the cylindrical body plate portion.

  In the invention according to claim 9, even if there is a range in the circumferential direction in which a crane or the like cannot be used due to other equipment approaching the periphery of the cylindrical body plate portion, A member such as a body plate can be safely and easily moved to such a circumferential range.

  According to the partial renewal method of the trunk plate of the tower tanks of the present invention, the trunk plate of the tower tanks can be partially renewed with a short construction period and low construction costs.

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 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 body plate 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. It is the top view which shows the order of 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 new division board, and a new division board. 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. It is a front view which shows the state which provided the reinforcement member for deformation prevention, and the update partial reinforcement member.

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 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. Then, as shown in FIG. 1, the cylindrical body plate portion 2 of the middle part in the vertical direction of the body plate 1 of the main distillation column is changed to a new one. 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 fitting and welding this new divided plate into the opening formed by partially punching the body body plate part 2 in the circumferential direction. change.

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. 2, a 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 (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. 3 (a) and 3 (b), a nozzle 21, a manhole 22, and an inner part for tray (support ring 23, as shown in FIG. 3 (c)). Clamp bar 24, bolt bar 25, footrest 26, etc.), and as shown in FIG. 3 (d), new external parts for mounting (moving lift lug 27, landing / ladder clip 28, etc.) are manufactured. As shown in FIG. 4, 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 that prevents the nozzle 21 from being deformed or damaged due to contact with other members or the like is attached in advance.

Next, as shown in FIG. 5, twelve new divided plates 3 are assembled into a cylindrical shape and temporarily welded.
Next, as shown in FIG. 6, a reference orientation 31 is entered in each of 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. 7, 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. 8, it does not attach components (for example, tray support ring) to the connection part of each new division board 3, but attaches it on the spot.
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. 10, between the 12th tray 11 and the 13th tray of the cylindrical body 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. 11, 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. 12 and 13, 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. 12 and FIG. 13, first, the cylindrical body plate portion 2 is formed in an arc shape along the circumferential direction by using the cutting machine guide 46 at each of two portions facing in the circumferential direction. Disconnect. 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. 14, 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. 15, 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 shown 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). Thereby, as shown in FIG. 16, the whole cylindrical trunk | drum board part 2 becomes a new cylindrical trunk | drum board part. 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. 17 and 18, 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.

  Then, as shown in FIG. 17, in order to fit the new dividing plate 3 moving in front of the opening 6 into the opening 6, two lift lugs 27 a and 27 b provided on the upper and lower sides of the inner surface of the new dividing plate 3 are used. First, the lower lift lug 27 a is pulled toward the opening 6, and the temporary welding jig 55 is brought into contact with the end face of the body plate 1 that forms the lower side (lower side) of the opening 6. Next, the upper lift lug 27b is pulled toward the opening 6 and brought into contact with the outer surface of the body plate 1 and the existing outer surface of the 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 into a new cylindrical body plate portion by the new dividing plate 3, the trolley beam 45 and the cutting machine guide 46 are removed, and then the trolley beam clip 42 and the cutting machine guide clip 41 are attached. Remove. Further, the moving lift lug 27 and the nozzle deformation preventing member 29 attached to the new divided plate 3 are removed.

Next, as shown in FIGS. 19 and 20, the notch member 23 a of the tray support ring is attached to the connection 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 and trolley station are then removed.

  In such a partial renewal method of the main distillation column shell plate, the cylindrical shell plate portion 2 to be renewed is partially cut and removed in the circumferential direction, and the new divided plate 3 is formed in the opening 6 generated by the removal. By repeating the attachment, the cylindrical body plate portion 2 is updated. That is, the cylindrical body plate part 2 to be updated is partially replaced with a new divided plate 3 one after another in the circumferential direction, thereby forming a new cylindrical body plate part. Since it is not necessary to remove the entire upper part above the body plate part 2 and the main distillation tower can be renewed while standing on the site, the construction period can be shortened and the construction cost can be reduced. Can be cheap. In particular, the fact that the construction period can be shortened can shorten the operation stop period of the entire facility and can reduce the loss due to the operation stop. And in the field of petroleum refining equipment and the like, it is strongly desired to shorten the operation suspension period as much as possible, so this renewal method is effective.

In addition, since the cylindrical body plate part 2 is renewed by removing a part of the cut body part of the cylindrical body plate part 2 and attaching a new divided plate 3, the handling member is not large in size. In addition, the construction space is small and the number of workers to be mobilized can be reduced to improve the construction safety.
In addition, unlike the lining method or metal spraying method, the mechanical strength of the main distillation tower can be restored because the body 1 is corroded and replaced with a new member. , Its life can be greatly extended.

  In addition, since the new divided plate 3 is obtained when the cylindrical body plate portion 2 is equally divided into a plurality of portions in the circumferential direction, the new divided plate 3 can be made into the same shape. Production and attachment work of the dividing plate 3 can be made efficient. The new dividing plate 3 is basically obtained when the cylindrical body plate portion 2 is equally divided in the circumferential direction. However, when the member such as the nozzle 21 is located at a position where the dividing is performed. In some cases, the division part (partition line) is slightly moved in the circumferential direction, and in this case, the circumferential dimension of the new division plate 3 is slightly different.

  In addition, since two circumferentially opposed cutting body plate portions of the cylindrical body plate portion 2 are cut and removed, and the new divided plate plate 3 is repeatedly attached to each opening 6 generated by the removal. 6 is 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. Furthermore, since the circumferential dimension of the new divided plate 3 is the same and each opening 6 has the same dimension, the balance of the section modulus in the circumferential direction of the cylindrical body plate portion 2 is further improved. Yes.

  In addition, since the circumferential dimension of the cut body plate part to be removed from the cylindrical body plate part 2 is set larger than the circumferential direction dimension of the new divided plate 3 to be attached, the opening 6 generated by removing the cut body plate part and Since a gap can be provided in the circumferential direction of the cylindrical body plate portion 2 between the new divided plate 3, a work tool such as a cord can be inserted or operated using this gap, Or an operator can go in and out of the trunk plate through the gap, and workability can be improved.

Further, since the hole 37 is opened from the inside to the outside of the cylindrical body plate portion 2 so as to serve as a mark for cutting positioning for removing the cutting body plate portion, an internal part or the like is formed inside the cylindrical body plate portion 2. After the ruled line corresponding to the position is entered, the ruled line for cutting the cutting cylinder plate portion can be easily and accurately entered outside the cylindrical cylindrical portion 2 with the hole 37 as a mark.
In addition, since a new division plate 3 is manufactured in the factory in advance and temporarily assembled and confirmed on the cylindrical body plate portion, it is transported to the construction site where the renewal work is performed. Thus, the construction period can be further shortened.

  Further, a trolley beam 45 is provided on the entire circumference of the cylindrical body plate portion 2, and members such as the cut body plate portion and the new divided plate 3 are used in the circumferential direction of the cylindrical body plate portion 2 by using the trolley beam 45. Even if there is a range in the circumferential direction where a crane or the like cannot be used because other equipment is approaching the circumference of the cylindrical body plate portion 2, the trolley station and such By using the trolley beam 45, the members such as the new divided plate 3 can be moved safely and easily. The trolley beam 45 may 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 embodiment, it is preferable to provide a reinforcing member when the progress of the corrosion of the cylindrical body plate portion 2 to be updated is severe and the thinning is large.
As the reinforcing member, for example, as shown in FIG. 21, before removing the cut body plate portion from the cylindrical body plate portion 2, the outer surface of the upper and lower body plates 1 in the vicinity of the cylindrical body plate portion 2. The deformation preventing reinforcement member 61 is attached by welding over the entire circumference. By providing the deformation preventing reinforcing member 61, the cylindrical body plate portion 2 is formed 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. 2 can be prevented from being deformed, and a cylindrical shape (perfect circle) can be maintained. The deformation preventing reinforcing member 61 is removed from the body plate 1 after the cylindrical body plate portion 2 is made a new cylindrical member. The deformation preventing reinforcement member 61 can be made of, for example, a section steel such as an H-section steel. For example, the deformation preventing reinforcing member 61 is wound around the entire circumference of the outer surface of the body plate 1 and fixed by welding or the like. The deformation preventing reinforcement member 61 may be provided on one of the outer surfaces of the upper or lower shell plate in the vicinity of the cylindrical shell plate portion 2.

Further, before removing the cut drum plate portion from the cylindrical drum plate portion 2, a plurality of update portion reinforcing members 63 extending in the vertical direction are attached to the outer surface of the cylindrical drum plate portion 2 at intervals in the circumferential direction by welding. . By providing this renewal portion reinforcing member 63, even when the strength of the cylindrical body plate portion 2 is greatly reduced due to corrosion or the like, the cut body plate portion is removed from the cylindrical body plate portion 2 without falling into a state of insufficient strength. Thus, the opening 6 can be formed. This renewal portion reinforcing member 63 has a cylindrical body plate together with the cut body plate portion (when attached to the cut body plate portion) when the opening body 6 is formed by removing the cut body plate portion from the cylindrical body plate portion 2. Removed from part 2. The renewal part reinforcing member 63 can be made of, for example, a section steel such as an H-section steel. The updated portion reinforcing member 63 is fixed to the outer surface of the cylindrical body plate portion 2 by welding or the like, for example. Only one updated partial reinforcing member 63 may be provided. Moreover, when providing the several update part reinforcement member 63, those space | intervals may not be equal. Moreover, you may provide the update part reinforcement member 63 toward not only the up-down direction but other directions, such as diagonally.
In FIG. 21, reference numeral 65 denotes a scaffold.

Further, in the above-described embodiment, the two parts that are opposed to each other in the circumferential direction of the cylindrical body plate portion 2 are replaced with the new divided plate 3. You may make it repeat repeating cutting and removing two parts which are not the place which opposes the circumferential direction, and attaching a new partial body board to each opening produced by removing.
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 embodiment, the new divided plate 3 is formed as a partial body plate having a shape obtained when the cylindrical body plate portion 2 is divided into a plurality of portions in the circumferential direction. Alternatively, a plurality of partial body plates having different circumferential dimensions may be formed without being divided equally. 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.

  Moreover, in the above-described embodiment, the opening 6 is formed next to the already-attached new divided plate 3 and the next new divided plate 3 is attached. The opening 6 may be formed at a distance from the dividing plate 3 and the new dividing plate 3 may be attached.

  In the above-described embodiment, the circumferential dimension of the opening 6 to be formed is set to be larger than the circumferential dimension of the new divided plate 3 to be attached. Also good.

  In the above-described embodiment, 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 Corrosion resistance or the like may be improved by using clad steel for the dividing plate 3 or lining the inner surface of the new dividing plate 3.

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

  In the above-described embodiment, the present invention is applied to the case where the main plate of the main distillation column is partially updated. However, the present invention is not limited to this and can be applied to other towers or tanks. . 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 37 Hole 61 Deformation prevention reinforcing member 63 Renewal part reinforcing member

Claims (9)

A method of renewing a cylindrical shell plate portion of a part of a shell plate of a tower tank,
It is a method of renewing the cylindrical body plate part by repeatedly cutting and removing the cylindrical body plate part to be renewed and attaching a new partial body plate to the opening formed by removing the part . ,
The partial renewal method of the trunk plate of the tower tanks characterized by setting the said cylindrical trunk | drum board part to update to the height range of 3-4m .   The said new partial trunk | drum is obtained when the said cylindrical trunk | drum board part is substantially equally divided | segmented into multiple in the circumferential direction, The trunk | drum of the tower tanks of Claim 1 characterized by the above-mentioned. Partial renewal method.   The two or more circumferentially opposing portions of the cylindrical body plate portion are partially cut and removed, and the new partial body plate is repeatedly attached to each opening generated by the removal. The partial renewal construction method of the trunk | drum of tower tanks of Claim 2.   The partial renewal of the trunk plate of the tower tanks according to any one of claims 1 to 3, wherein a circumferential dimension of the opening is made larger than a circumferential dimension of the new partial trunk plate to be attached. Construction method.   The deformation preventing reinforcing member is attached to the entire circumference of the body plate in the vicinity of the cylindrical body plate portion before the opening is formed. Partial renewal method for the shell plates of tower tanks.   6. The partial renewal method for a trunk plate of a tower tank according to claim 1, wherein an update portion reinforcing member is attached to the cylindrical body plate portion before the opening is formed. 7.   The hole according to any one of claims 1 to 6, wherein a hole is formed from the inner side to the outer side of the cylindrical body plate portion so as to serve as a mark for cutting and positioning for forming the opening. Partial renewal method for the shell plates of tower tanks.   8. The factory according to claim 1, wherein the new partial body plate is manufactured in a factory, temporarily assembled and confirmed on a new cylindrical body plate part, and then transported to a site where renewal work is performed. The partial renewal construction method of the trunk plate of tower tanks in any one.   A trolley beam is provided along a circumferential direction of the cylindrical body plate portion, and a member such as the new partial body plate is moved in the circumferential direction of the cylindrical body plate portion using the trolley beam. The partial renewal construction method of the trunk plate of the tower tanks in any one of Claims 1 thru | or 8.

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