JP2003182790A - Method of replacing tank bottom plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of replacing a tank bottom plate with which a replacement operation of the bottom plate is simplified without deforming a shell plate, a replacement cost can be inexpensive, and there is no fear of troubles occurring due to jacking. <P>SOLUTION: The method comprises a first process of mounting a vertical reinforcing member 39 substantially vertically on an inner peripheral surface 37 of a shell plate 13 through a position corresponding to a jack seat 15, a second process of separating the shell plate 13 from the bottom plate 12, a third process of jacking the shell plate 13 up, a fourth process of supporting the raised shell plate 13 by a strut 17 instead of a jack 16 via a coupling means, a fifth process of dividedly carrying the bottom plate 12 out and dividedly carrying a new bottom plate in for setting it up, a sixth process of supporting the raised shell plate 13 by the jack 16 and jacking it down, and a seventh process of joining the shell plate 13 with the new bottom plate which has been set up and in addition removing the reinforcing member 39. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank bottom plate replacement method for replacing a corroded existing tank bottom plate with a new bottom plate.

[0002]

2. Description of the Related Art Conventionally, in a flat-bottomed cylindrical tank for storing oil or the like, a method of replacing a corroded bottom plate with a new bottom plate is to separate the body plate from the existing bottom plate and then lift the body plate with a jack to install the existing body. After disassembling and removing the bottom plate of (1) and disposing a new bottom plate, the body plate is lowered onto the new bottom plate by a jack, and the body plate and the bottom plate are welded. In order to lift the torso plate with the jack, a plurality of jack seats are provided on the lower outer peripheral surface of the torso plate at predetermined intervals, and each jack seat has a curved surface along the outer peripheral surface of the torso plate. On a rectangular reinforcing plate whose portion is welded to the outer surface of the body plate, a horizontally arranged jack seat body for receiving a contact portion of a jack rod is provided via a reinforcing rib or the like. When the body plate from which the bottom plate has been removed is lifted by the jack, the body plate is deformed, that is, the body plate above the jack seat falls inward around the jack seat, while the body plate below the jack seat In order to prevent it from spreading to the outside,
On the inner peripheral surface of the body plate, annular reinforcing rings made of shaped steel are provided above and below the jack seat, respectively.After welding the new bottom plate and the body plate, these reinforcing rings are I'm trying to remove it.

[0003]

However, in the conventional method for replacing the tank bottom plate, there are still the following problems to be solved. Since the reinforcing ring is provided on the inner peripheral surface of the body plate, it is necessary to manufacture, attach and detach a large-sized reinforcing ring, which causes a problem that replacement time becomes long and replacement cost increases. Also,
After the body plate is lifted by the jack, the body plate is supported by the jack as it is, if necessary, so the usage time of the jack becomes long and the operation rate of the jack becomes high. In the case of hydraulic type,
There was also a risk of problems due to oil leaks.

The present invention has been made in view of the above circumstances, and the work of replacing the bottom plate can be simplified without deforming the trunk plate, the replacement cost can be reduced, and there is a concern that a trouble will occur due to a jack. It is an object of the present invention to provide a method for replacing an empty tank bottom plate.

[0005]

A method for replacing a tank bottom plate according to the present invention, which is directed to the above object, is a method in which a tank body plate separated from a bottom plate is jacked through a plurality of jack seats provided on its outer peripheral surface. A method of moving up and down to replace the bottom plate of the tank, in which a vertical reinforcing member is attached to the inner peripheral surface of the trunk plate substantially vertically through a position corresponding to the jack seat, and the jack seat is attached to the outer peripheral surface of the trunk plate. The first step of mounting, the second step of separating the body plate and the bottom plate in a state where the tank is supported by the jack through the jack seat, and the separated body plate is jacked up by the jack through the jack seat. A third step and a fourth step in which the body plate lifted by the jack is supported by a support column arranged outside the tank via a connecting means instead of the jack or with the jack left as it is. And the fifth step of dividing the bottom plate of the tank to carry it out and carrying in a new bottom plate to divide it into pieces, and releasing the connecting means, supporting the lifted trunk plate with a jack, and further lifting the trunk plate. It has a sixth step of jacking down with a jack and a seventh step of joining the separated body plate to a new assembled bottom plate and removing the vertical reinforcing member. As a result, the body plate can be jacked up and down by the jack without deforming the body plate by the vertical reinforcing member, and further, the lifted body plate can be supported by the support column via the connecting means. it can.

In the method of replacing a tank bottom plate according to the present invention, the vertical reinforcing member has a plurality of gate jigs whose bases are attached to the inner peripheral surface of the body plate of the tank at a predetermined pitch,
Also, it may be configured to be fixed via a wedge member inserted between the gate jig and the vertical reinforcing member. As a result, it is not necessary to directly fix the vertical reinforcing member to the inner peripheral surface of the body plate of the tank. In the method of replacing the tank bottom plate according to the present invention, the connecting means is provided perpendicularly to the tip of the jack seat, and has a first mounting seat having a first mounting hole, and a first mounting seat.
Second mounting seat, which is provided perpendicular to the support pillar facing the mounting seat of No. 2, and in which a second mounting hole corresponding to the first mounting hole is formed, and the first mounting hole and the second mounting hole. It can also be configured to include a bolt that is inserted into. by this,
The connection structure between the jack seat and the support pillar is simplified, and the connection work can be facilitated.

In the method for replacing a tank bottom plate according to the present invention, before the first step, a vertical reinforcing member and an opening for loading and unloading the divided bottom plate are formed at the lower end of one side of the body plate, After carrying out the vertical reinforcing member, close the opening, and
The vertical reinforcing member may be H-shaped steel in which the flange on one side abuts on the inner peripheral surface of the body plate of the tank.
As a result, the vertical reinforcing member and the divided bottom plate can be easily carried in and out, and the lighter vertical reinforcing member can prevent the body plate from being deformed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. 1 is a layout view of a tank bottom plate replacement device to which a tank bottom plate replacement method according to an embodiment of the present invention is applied, and FIG. 2 is an explanatory view of the tank bottom plate replacement device.

As shown in FIGS. 1 and 2, a tank bottom plate replacement device (hereinafter simply referred to as a replacement device) 1 to which a tank bottom plate replacement method according to an embodiment of the present invention is applied.
0 is a plurality of body plates 13 separated from the bottom plate 12 of the existing tank 11 on the outer peripheral surface 14 of the body plate 13 (12 in FIG. 1).
It is a device used for replacing the bottom plate 12 of the existing tank 11 with a new bottom plate by moving up and down by the jack 16 through the provided jack seat 15. These will be described in detail below.

As shown in FIGS. 1 and 2, the replacement device 1
Each of the single members constituting 0 is a jack 16 for supporting the respective jack seats 15 provided at an equal pitch in the circumferential direction on the lower end portion of the outer peripheral surface 14 of the body plate 13 of the tank 11, and the outside of the jack seat 15. And the support column 17 disposed in the support column 17, and the jack seat 15 is detachably attached to the support column 17 via a connecting means (described later). As shown in FIG. 2, the jack 16 is set on a jack mounting table 19 made of short wood having a rectangular cross section, which is arranged on a floor surface 18 with an iron plate 18a interposed therebetween.

As shown in detail in FIG. 2, the jack seat 15
Is a rectangular reinforcing plate 20 entirely welded to the lower end of the outer peripheral surface 14 of the body plate 13 of the tank 11, and a short H-shaped steel horizontally welded to the outer surface of the reinforcing plate 20 and arranged horizontally. And a rectangular flange plate 22 that is an example of a first mounting seat that is provided perpendicularly to the tip of the jack seat body 21. A bolt hole 2 which is an example of a first mounting hole for connecting the jack seat 15 to the support column 17 via the bolt 36a is provided on the outer peripheral portion of the flange plate 22.
3 are formed at a plurality of locations. At an intermediate position in the horizontal direction of the main body of the jack seat 21, approximately on the axial center of the jack 16,
Rectangular reinforcing ribs 26 are provided on both sides of the jack seat body 21 between the lower flanges 24 and 25 with a web 27 interposed therebetween. Lower flange 25 just below the web 27
A disc-shaped contact portion 29 with which the tip end portion of the rod 28 of the jack 16 contacts is provided on the lower surface of the.

As shown in FIG. 2, the support pillar 17 is also attached to the floor 3
0 is arranged on a support column mounting table 31 made of short wood having a rectangular cross section, and the support column 17 has a rectangular seat plate 32 that abuts the support column mounting table 31, and a seat plate 32.
An H-shaped steel 33, which is an example of a vertical member provided perpendicularly to the upper surface of the, and a rectangular upper end plate 34 provided at the upper end of the H-shaped steel 33. The flange 35, which is an example of the second mounting seat on the body plate 13 side of the H-shaped steel 33, has the jack seat 15
Bolt holes 36, which are an example of second mounting holes, which coincide with the bolt holes 23 formed in the flange plate 22 are formed at a plurality of positions. Therefore, the connecting means between the jack seat 15 and the support column 17 is the flange plate 22 at the tip of the jack seat 15.
A bolt hole 23 formed in the flange plate 22, a flange 35 of the H-shaped steel 33 of the support column 17, a bolt hole 36 formed in the flange 35 corresponding to the bolt hole 23, the bolt hole 23 and the bolt. Bolt 36a inserted through hole 36
(Nut if necessary).

When the body plate 13 from which the bottom plate 12 is separated is supported by the jack 16 via the jack seat 15, a bending moment is generated in the body plate 13 via the reinforcing plate 20 based on the reaction force of the jack 16. Due to this bending moment, the upper side of the body plate 13 tends to be deformed to the inside of the tank 11 while the lower side of the body plate 13 is deformed to the outer side of the tank 11 around the reinforcing plate 20. In order to prevent this deformation, FIG.
Further, as shown in FIG. 2, a plurality (five in the present embodiment) of gate-shaped jigs 38 are attached to the inner peripheral surface 37 of the body plate 13 at a predetermined pitch P by welding on the base side thereof. . In the concave groove portion of the gate jig 38, an example of a vertical reinforcing member H
The shaped steel 39 is attached to the inner peripheral surface 37 of the body plate 13 on one side of the flange 4
0 is abutted, and an H-shaped steel 39 is inserted between each gate-shaped jig 38 and the H-shaped steel 39.
Wedge members 41 are respectively inserted in order to firmly press against the inner peripheral surface 37 of the. It should be noted that in order to handle the attachment and detachment as easily as possible, and to suppress the deformation of the body plate 13 to a minimum, the section modulus per unit length is large H
Shaped steel 39 is used, and the H-shaped steel 39 is disposed substantially vertically through the position X corresponding to the jack seat 15.

In the conventional method of replacing the tank bottom plate, reinforcing rings are provided above and below the jack seat in order to prevent deformation of the body plate when jacking up the body plate with the bottom plate separated. However, as a result of performing stress analysis on the body plate, the jack seat, the reinforcing ring, and the like using the finite element method (FEM), the inventor of the present application found that the vertical reinforcing member (H-shaped steel 3
It was concluded that 9) was more effective than the reinforcing ring. Therefore, based on this conclusion, in the present embodiment, the vertical reinforcing member is provided instead of the reinforcing ring. Reference numeral 43 in FIG. 2 indicates that a part of the body plate 13 side is placed on the upper flange 24 of the jack seat 15, surrounds an upper end portion of the flange plate 22 of the jack seat 15, and further, supports the support pillar 17. It shows a positioning plate that surrounds the H-shaped steel 33 and moves up and down.

Next, regarding the method of replacing the tank bottom plate according to the embodiment of the present invention using the replacement device 10,
This will be described with reference to FIGS. 1 and 2. (Preparation process) As shown in FIG.
An H-shaped steel 39, the divided bottom plate 12, and an opening 42 for loading and unloading a new bottom plate are formed at the lower end of one side. (First step) As shown in FIG. 2, the body plate 13 of the tank 11
A plurality (five in the present embodiment) of gate-shaped jigs 38 are welded to the inner peripheral surface 37 of (1) at a predetermined pitch P in the vertical direction through the position X corresponding to the jack seat 15. Each gate type jig 38
The H-shaped steel 3 is provided between the concave groove portion of FIG.
9, while holding the H-shaped steel 39, a wedge member 41 is inserted between each gate-shaped jig 38 and the H-shaped steel 39 to move the H-shaped steel 39 to the inner peripheral surface 37 of the body plate 13. Press firmly against. Also,
The outer peripheral surface 14 of the body plate 13 is parallel to the mounting of the H-shaped steel 39.
The jack seat 15 provided with the reinforcing plate 20 is attached by welding.

(Second step) A jack placing table 19 and a supporting column placing table 31 are provided on the floor surfaces 18 and 30, respectively, and the jack 16 is set on the jack placing table 19, while being supported on the supporting column placing table 31. Set the pillar 17. Jack 1
While the tank 11 is supported by the jack 16 via the connector 5, the joint between the body plate 13 and the bottom plate 12 is fused and separated. (Third step) The body plate 13 from which the bottom plate 12 is separated is jacked up to a predetermined height by the jack 16 via the jack seat 15. At this time, the flange 35 of the support column 17
Guides the flange plate 22 of the rising jack seat 15. The height position of the body plate 13 is confirmed by the positioning plate 43.

(Fourth step) The body plate 13 lifted by the jack 16 is supported by a support column 17 arranged outside the tank 11 via a connecting means instead of the jack 16. At this time, the jack 16 is removed from the jack mounting table 19 so that it can be used for other purposes or can be immediately reused when the body plate 13 is lowered later. It is also possible to place it on 19 as it is. (Fifth Step) The separated bottom plate 12 is divided by fusing and carried out through the opening 42, a new bottom plate is divided and carried through the opening 42, and a new bottom plate is assembled by welding.

(Sixth step) The body plate 13 lifted by releasing the connecting means is supported by the jack 16, and the body plate 13 is jacked down by the jack 16. (Seventh step) The separated body plate 13 is joined to the assembled new bottom plate. At the same time, the inner peripheral surface 37 of the body plate 13
The H-shaped steel 39 is removed by fusing the gate-shaped jig 38 provided in the above and the jack seat 15 is removed. (Post-Process) After the H-shaped steel 39 is carried out, the opening 42 is closed. Further, the gate jig 38 and the jack seat 15 are finished.

In the above embodiment, the H-section steel 39 is provided on the inner peripheral surface 37 of the body plate 13 of the tank 11 at a predetermined pitch P.
Then, although fixed through a plurality of gate jigs 38 and wedge members 41, the present invention is not limited to this, and H-section steel 39 is spot-welded directly to the inner peripheral surface 37 of the body plate 13 if necessary. You can also Further, instead of the plurality of gate jigs 38 and the wedge members 41, the H-shaped steel 39 is replaced with the H-shaped steel 39 by using another attachment method.
It can also be pressed without welding. The means for connecting the jack seat 15 and the support pillar 17 includes a flange plate 22 provided at the tip of the jack seat 15, a flange 35 provided on the support pillar 17, and a bolt 36 a connecting the flange plate 22 and the flange 35. However, the connection structure is not limited to this, and other connection structures can be used.

Before the first step, the loading and unloading opening 42 was formed at the lower end of one side of the body plate 13, but the invention is not limited to this, and the opening 42 may be formed depending on the situation. It doesn't matter. Although the H-shaped steel 39 is used as the vertical reinforcing member, the present invention is not limited to this, and it is also possible to adopt a structure in which other shaped steels (channel steel, chevron steel, I-shaped steel, etc.) or steel pieces are combined and welded. . Jack 15 and H-shaped steel 39 1
Two pieces are used, but the number is not limited to this, and the number may be changed as necessary. In addition to the hydraulic type jack 16,
A manual type, an electric type, or a pneumatic type can also be used.

[0021]

In the method of replacing the tank bottom plate according to the first to fourth aspects of the present invention, since the trunk plate can be jacked up and down by the jack without deforming the trunk plate by the vertical reinforcing member, it is possible to use the conventional method. There is no need for a large-scale reinforcing member such as a reinforcing ring, and since the lifted body plate can be supported by the support pillars via the connecting means, troubles due to oil leakage such as in the case of a hydraulic jack are prevented. It can be avoided. Particularly, in the method for replacing the tank bottom plate according to the second aspect, since it is not necessary to directly fix the vertical reinforcing member to the inner peripheral surface of the body plate of the tank, the vertical reinforcing member that has been used once can be reused without scraping it. It can be used or used separately and is economical.

In the method of replacing the tank bottom plate according to the third aspect, since the connecting structure between the jack seat and the supporting column is simplified, the device can be made compact and the connecting work can be simplified, so that the workability is improved. improves. In the method of replacing the tank bottom plate according to the fourth aspect, the workability is improved because the vertical reinforcing member and the divided bottom plate can be easily carried in and out. Moreover, the H-shaped steel, which is a lighter vertical reinforcing member, can prevent the body plate from being deformed, so that the vertical reinforcing member can be easily handled.

[Brief description of drawings]

FIG. 1 is a layout view of a tank bottom plate replacement device to which a tank bottom plate replacement method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory view of the tank bottom plate replacement device.

[Explanation of symbols]

10: tank bottom plate replacement device, 11: tank, 12:
Bottom plate, 13: body plate, 14: outer peripheral surface, 15: jack seat,
16: jack, 17: support pillar, 18: floor surface, 18a:
Iron plate, 19: jack mounting table, 20: reinforcing plate, 21: jack seat body, 22: flange plate (first mounting seat), 2
3: Bolt hole (first mounting hole), 24: Upper flange, 2
5: Lower flange, 26: Reinforcing rib, 27: Web, 2
8: Rod, 29: Abutting part, 30: Floor surface, 31: Support column mounting table, 32: Seat plate, 33: H-section steel (vertical member), 3
4: upper end plate, 35: flange (second mounting seat), 36:
Bolt hole (second mounting hole), 36a: Bolt, 37: Inner peripheral surface, 38: Gate jig, 39: H-shaped steel (vertical reinforcing member), 40: Flange, 41: Wedge material, 42: Opening Division, 4
3: Positioning plate

Claims (4)

[Claims] 1. A method for replacing a bottom plate of a tank by raising and lowering a body plate of a tank separated from a bottom plate by a jack through a plurality of jack seats provided on the outer peripheral surface of the body plate. A vertical reinforcing member is mounted on the peripheral surface substantially vertically through a position corresponding to the jack seat, and the jack seat is mounted on the outer peripheral surface of the body plate.
A step of separating the body plate and the bottom plate in a state where the tank is supported by the jack through the jack seat, and the separated body plate through the jack seat through the jack seat. The third step of jacking up with the body plate lifted by the jack,
Instead of the jack or leaving the jack as it is, a fourth step of supporting by a supporting column arranged outside the tank through a connecting means, and the bottom plate of the tank are divided and carried out, and a new bottom plate is installed. A fifth step of dividing and carrying in and assembling, a sixth step of releasing the connecting means, supporting the lifted body plate with the jack, and further jacking down the body plate with the jack A seventh step of removing the vertical reinforcing member while joining the assembled body plate to the assembled new bottom plate, and replacing the tank bottom plate. 2. The tank bottom plate replacement method according to claim 1, wherein the vertical reinforcing member has a plurality of gate-shaped jigs, the base side of which is attached to the inner peripheral surface of the body plate of the tank at a predetermined pitch. And a method of replacing the tank bottom plate, characterized in that it is fixed via a wedge member inserted between the gate-shaped jig and the vertical reinforcing member. 3. The tank bottom plate replacement method according to claim 1 or 2, wherein the connecting means is provided vertically to a tip of the jack seat, and a first mounting seat having a first mounting hole is formed. A second mounting seat that faces the first mounting seat, is provided perpendicularly to the support column, and has a second mounting hole that matches the first mounting hole; and the first mounting seat. A method for replacing a tank bottom plate, comprising: a hole and a bolt inserted into the second mounting hole. 4. The tank bottom plate replacement method according to claim 1, wherein before the first step,
An opening for loading and unloading the vertical reinforcing member and the divided bottom plate is formed at a lower end of one side of the body plate, and after the vertical reinforcing member is carried out, the opening is closed and the vertical A method for replacing a tank bottom plate, wherein the reinforcing member is an H-shaped steel whose one side flange is in contact with the inner peripheral surface of the body plate of the tank.