JP5941696B2 - Storage tank dismantling method and construction method, and dismantling or construction equipment - Google Patents

Description

  The present invention relates to a storage tank dismantling method and a construction method and a storage tank dismantling or construction facility, which can reduce the weight of temporary equipment and facilitate work, and can perform work without using heavy machinery even in a small site. It is related to technology.

  An above-ground storage tank for liquid fuel such as crude oil, gasoline, heavy oil, kerosene, and liquefied gas generally has a circular bottom plate, a cylindrical side plate formed on the bottom plate, and a roof. The side plate is composed of a plurality of side plate pieces divided in the vertical direction and the circumferential direction. The roof includes a fixed roof type, a floating roof type, and a combination of these, and the fixed roof includes a conical roof and a spherical roof.

  When building a fixed-roof storage tank, use a crane, lay the bottom plate, assemble the first-stage side plate piece at the bottom, and then place the side plates on the second and third steps in that order. After assembling the pieces and assembling the uppermost side plate piece, assemble the roof while directly joining the uppermost side plate piece, or the roof assembled on the bottom plate to the top of the side plate by air lasing method or jack-up method The method of pushing up and joining to a side plate is common. Also, when dismantling the storage tank, the reverse procedure is to disassemble the roof first, then cut the side plates to an appropriate size and disassemble them in order from the top to the bottom. It is common.

  On the other hand, when constructing a double-shell tank having a fixed roof type outer tub and an inner tub disposed inside, it is impossible to construct the inner tub until the construction of the outer tub roof is completed. After assembling the uppermost part of the side plate and the roof first on the bottom plate and jacking up the uppermost part of the side plate integrated with the roof to a predetermined height with a scale insect action by multiple jack equipment arranged on the outer periphery of the side plate Execute the assembly work of the inner tank side plate and the side plate assembly work of the next part of the outer tank in parallel, then jack up the next stage part of the outer tank side plate and the uppermost part of the inner tank side plate to a predetermined height In the same manner, a tank construction method has been proposed in which the addition work for one stage of the outer tank side plate and the inner tank side plate is repeated (see Patent Document 1).

JP 2000-328809 A

  However, in the construction method of Patent Document 1, when jacking up the uppermost portion of the side plate, only the first group of jacks arranged every other one out of the jacks arranged around the side plate are used. When jacking up the stepped portion, only the remaining second group of jacks is used, so that twice the number of jacks required to jack up the tank is required. In addition, in order to engage the jack, it is necessary to fix a jack-up piece to each step of the side plate, which increases the number of locations where the temporary parts are connected to the tank body, and requires removal work. In addition, it is necessary to refill the jack itself (moving by the action of a scale insect). On the other hand, when the equipment used in this method is applied to the dismantling work of the tank, the number of jacks is twice as large as the tank weight, and a lot of temporary parts for engaging the jack are required. The point and the point that the replacement work of the jack itself is complicated are the same as at the time of construction.

  The present invention has been made in view of such a background, and it is possible to reduce the number of jacks to be used, to suppress the number of locations where temporary parts are coupled to the tank body, and to facilitate the construction and disassembly of a storage tank. The first object of the present invention is to provide a method and further a facility for dismantling or constructing a storage tank capable of realizing these methods.

  In the construction method of Patent Document 1, it is not necessary to use a heavy machine when jacking up the tank. However, a heavy machine is required when installing the jack equipment, and when carrying or installing a tank material such as a side plate member. If heavy machinery is not used, the work is complicated. Further, when the facility of Patent Document 1 is applied to the dismantling of the tank, not only the work of welding the suspension pieces is necessary to temporarily suspend the side plate cutting pieces to be disassembled, but also the removal of the disassembled side plate cutting pieces. The work is also complicated. Therefore, it is unsuitable for work in a narrow field where heavy machinery cannot be installed.

  Accordingly, the present invention provides a storage tank construction method and dismantling method that can be used without using heavy machinery and is suitable for a small site, and further a storage tank dismantling or construction facility that can realize these methods. Its second purpose is to provide it.

In order to solve the above problems, the present invention provides a storage tank (1) having a bottom plate (3) and a cylindrical side plate (4) constructed on the bottom plate. A method of disassembling the storage tank that is divided and divided into side plate portions (4a _{1 to} 4a ₄ ), wherein a jack cradle (21) having a height higher than the side plate is set at a predetermined interval along the side plate. A plurality of steps, the step of installing the jack (22) at a position higher than the upper end of the side plate of each jack cradle, the suspension member (23) is provided so as to be engageable with the jack cradle and the jack, and the uppermost stage The side plate portion (4a ₄ ), the step of removing the lowermost side plate portion (4a ₁ ) on the bottom plate in a state where the side plate is suspended by the suspension material, Engaged with jack Wherein the jack is contracted, the comprising the steps of lowering the bottom of the side plate portion (4a ₁₎ is removed plate (4), the steps and the side plate to remove the bottom of the side plate portion (4a) Te ( The step of lowering 4) is repeated, and all the side plate portions are removed without changing the joining position of the suspension members.

  By using the disassembling method having such a configuration, all the jacks can be used when the side plate is lowered, so that the necessary number of jacks can be reduced. Further, since the suspension member only needs to be coupled once to the uppermost side plate portion, the number of locations where the temporary parts are coupled to the tank body can be suppressed, and the work can be facilitated by eliminating the replacement of the jack.

  Further, according to one aspect of the present invention, the rail (32) supported by the plurality of jack mounts is provided so as to extend around the side plate, and the lifting means is movable along the rail. In the step of removing the side plate portion (4a), the step (4b) of removing the side plate portion may be carried out by the lifting means.

  According to this configuration, the side plate cut piece can be disassembled while being temporarily suspended by the lifting means. Therefore, there is no need to provide a temporary suspension piece such as a chain block, and the disassembly work is easy. Moreover, since the disassembled side plate cut piece can be transported by being moved along the rail while being suspended by the lifting means, it is easy to carry out the side plate cut piece. Therefore, it is also suitable for a narrow site where heavy machinery cannot be installed.

In order to solve the above problems, the present invention provides a cylinder bottom plate (3) is constituted by the side plate portions of the plurality of stages divided vertically (14a ₁ to 14A _4), is constructed on the bottom plate on A storage tank (11) having a side plate (14) in the form of a jack, and a jack cradle (21) having a height higher than that of the side plate to be constructed, along the position where the side plate is installed. A step of installing a plurality of jacks (22) at a position higher than the upper end of the side plate of each jack mount, and a step of assembling the uppermost side plate portion (14a ₄ ) on the bottom plate; into engagement with the step together with hanging member (23) provided to be engaged with the jacking frame and the jack is coupled to the side plate portion on the bottom plate (14a _4), said hanging member to said jack Is extended to the jack, the assembled comprising the steps of raising the side plate portion on the bottom plate (14a _4), in a state in which the an elevated side plates portions (14a ₄₎ was suspended in the suspension member, the next stage on the bottom plate Assembling the side plate portion (14a ₃ ) so as to be integrally joined to the upper side plate portion (14a ₄ ) thereof, and a step of raising the side plate portion (14a) on the bottom plate by a predetermined dimension and the next step on the bottom plate The step of assembling the side plate portion (14a) is repeated to assemble the lowermost side plate portion (14a ₁ ) without changing the position of the suspension member.

  By setting it as the construction method of such a structure, since all the jacks can be used when raising a side plate, the required number of jacks can be decreased. In addition, since the suspension member only needs to be coupled once to the uppermost side plate portion, the number of locations where the temporary parts are coupled to the tank body can be suppressed, and the work can be facilitated without replacement of the jack.

  According to another aspect of the present invention, each of the side plate portions (14a) includes a plurality of side plate pieces (14b) divided in the circumferential direction, and is supported by the plurality of jack mounts. The step of assembling the side plate portion (14a) further comprising the step of providing a rail (32) extending around the side plate and providing a lifting means (35) movable along the rail; The side plate piece (14b) can be carried in by the lifting means.

  According to this configuration, since the side plate piece can be moved and conveyed along the rail while being suspended by the lifting means, the side plate piece can be easily carried in. Further, the side plate piece can be assembled by being suspended by the lifting means. Therefore, it is not necessary to provide a suspension piece for temporary suspension, and assembly work is easy. Therefore, it is also suitable for a narrow site where heavy machinery cannot be installed.

In order to solve the above problems, the present invention includes a bottom plate (3) and a cylindrical side plate (4) constructed on the bottom plate, and the side plate is divided into a plurality of stages divided in the vertical direction. A facility (20) for disassembling or constructing a storage tank (1, 11) composed of side plate portions (4a _{1 to} 4a ₄ , 14a _{1 to} 14a ₄ ), and disposed at a predetermined interval along the side plate. A plurality of jack stands (21) having a height higher than that of the side plates, jacks (22) installed on the jack stands at positions higher than the upper ends of the side plates, the jack stands, and A suspension member (23) which is provided so as to be engageable with the jack and is coupled to the uppermost side plate portion (4a ₄ , 14a ₄ ) and suspends the side plate, and the suspension member is mounted on the bottom plate The uppermost side plate part placed on And _{(4a 4,} 14a 4) is a possible length coupled to the configuration.

  According to this configuration, since all jacks can be used when the side plate is lowered or raised, the required number of jacks can be reduced. Further, since the suspension member only needs to be coupled once to the uppermost side plate portion, the number of locations where the temporary parts are coupled to the tank body can be suppressed, and the work can be facilitated by eliminating the replacement of the jack.

  Further, according to one aspect of the present invention, there is further provided a rail supported by the plurality of jack mounts and extending around the side plate, and a lifting means movably provided on the rail. can do.

  According to this configuration, the disassembled side plate cut piece or the assembled side plate piece can be moved and transported along the rail while being suspended by the lifting means, so that the side plate cut piece carry-out work or the side plate piece carry-in work is easy. . Further, the side plate pieces can be disassembled by being suspended by lifting means, or the side plate pieces can be assembled. Therefore, it is not necessary to provide a suspension piece for temporary suspension, and assembly work is easy. Therefore, it is also suitable for a narrow site where heavy machinery cannot be installed.

  As described above, according to the present invention, the number of jacks to be used can be reduced, the number of locations where temporary parts are coupled to the tank body can be suppressed, and a construction method and a dismantling method of a storage tank that can be easily operated, and these methods A storage tank disassembly or construction facility that can be realized can be provided.

Side view of the existing storage tank according to the embodiment Plan view of dismantling and construction equipment according to the embodiment Cross-sectional view of dismantling and construction equipment according to the embodiment Part IV enlarged view of FIG. Explanatory drawing of the dismantling procedure of the existing storage tank shown in FIG. Operational explanatory diagram of the center hole jack shown in FIG. Explanatory drawing of the construction procedure of the new storage tank concerning an embodiment

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

  First, the configuration of an existing storage tank for oil storage (hereinafter referred to as an existing tank 1) will be described with reference to FIG. The existing tank 1 is joined to a circular bottom plate 3 made of an iron plate laid on a bottom slab 2 made of reinforced concrete, a cylindrical side plate 4 made of an iron plate raised from the periphery of the bottom plate 3, and an upper edge of the side plate 4. It is comprised from the roof 5 made. The roof 5 is a conical roof supported by a truss structure frame 6 joined to the upper edge of the side plate 4.

  In this embodiment, after the existing tank 1 is dismantled and removed while leaving the bottom plate 3, the side plate 14 and the roof 15 (see FIG. 7) are newly constructed, and a new installation having the same configuration as the existing tank 1 is made. As a storage tank (hereinafter referred to as a new tank 11), disassembly and construction will be described in series in the work procedure described later. In addition, although the equipment used for the dismantling of the existing tank 1 and the construction of the new tank 11 is common, it shall be referred to as the tank construction equipment 20 here.

  As shown in FIG. 2 and FIG. 3, the tank construction facility 20 includes eight jack stands 21, eight jacks 22 installed on each jack stand 21, and eight jacks 22 that can be engaged with the jacks 22. The main suspension element 23 is a book.

  Eight jack stands 21 are arranged along the side plate 4 at equal intervals. Each jack mount 21 includes a pair of struts 24o and 24i (generally referred to as struts 24) arranged on the inside and outside of the side plate 4, and the upper ends of the pair of struts 24 extending horizontally. And a connecting member 25 for connecting the two. Each support column 24 has a height higher than that of the side plate 4, and plates are provided on the upper and lower ends of the steel pipe so that it can be transported manually and can be installed without using a heavy machine having a crane facility. A plurality of (two in this case) support members 24a are coaxially connected in the vertical direction. An opening 5 a (FIG. 3) is formed in advance on the roof 5 at a position corresponding to the inner column 24 i, and the inner column 24 i is installed so as to penetrate the roof 5. The jack pedestal 21 is positioned so as to straddle the side plate 4.

  Although not shown in FIG. 3 for the sake of complexity, an elevating equipment 26 including a temporary scaffold is provided around each jack mount 21 as indicated by an imaginary line in FIG. The upper part of the gantry 21 can be accessed. When installing the outer support | pillar 24o, an operation | work can be easily performed by utilizing the raising / lowering equipment 26 as a scaffold. On the other hand, no elevating equipment is provided around the inner support column 24i (inside the existing tank 1), but by installing a winch and a chain block using the roof 5 of the existing tank 1, installation work of the inner support column 24i is performed. Can be made easier.

  As shown in FIG. 4, the jack 22 is a hydraulic center hole jack that expands and contracts when hydraulic oil is supplied and discharged, and the ram chair 27 is fixed to the upper surface of the connecting member 25 so as to be positioned directly above the side plate 4. It is installed on the jack mount 21 at a position higher than the upper end of the side plate 4. Either the electric pump unit or the manual pump unit may be used for supplying and discharging the hydraulic oil to and from the jack 22. Note that a through hole 25 a is formed in the connecting member 25 at a position corresponding to the center hole of the jack 22, that is, directly above the side plate 4, so that the suspension member 23 can be inserted.

  The suspension member 23 is a full thread PC steel rod having a screw formed on the outer surface over its entire length, and is inserted into the center hole of the jack 22, and in this state, the upper portion of the jack 22 and the interior of the ram chair 27 (the connecting member 25). The nuts 28 (28u and 28l) are screwed together with the jacks 22 through the upper nuts 28u, and the jack base 21 through the lower nuts 28l. Can be engaged. A connection hardware 29 is screwed to the lower end of the suspension member 23, and the connection hardware 29 is welded to the upper end of the side plate 4, so that the suspension material 23 suspends the side plate 4 and applies the load to the jack base 21. Can be communicated to.

In the present embodiment, by dividing the side plate 4 up and down at a position shown in phantom in FIG. 1, described below as a fourth stage of the side plate portions 4a (and _{4a 1, 4a 2, 4a 3} , 4a 4 in order from the bottom) In this case, the suspension member 23 has such a length that the uppermost side plate portion 4a ₄ can be placed on the bottom plate 3, in other words, the suspension member 23 is engaged with the jack 22. In this state, the length is such that it can be coupled to the uppermost side plate portion 4 a ₁ placed on the bottom plate 3.

  As shown in FIG. 3, each jack mount 21 is connected to the adjacent jack mounts 21 on both sides in the circumferential direction by horizontal reinforcing members 30 and braces 31. The horizontal reinforcing member 30 and the brace 31 connect the outer support columns 24o to each other. As shown in FIG. 2, the distance from the side plate 4 of the outer support member 24o is such that the horizontal reinforcing member 30 and the brace 31 are connected to the side plate 4. Is set so as to be separated from the side plate 4 even in the central portion in the length direction closest to the side plate. As the horizontal reinforcing member 30, for example, a steel pipe can be used. For the brace 31, for example, a steel pipe or a wire can be used.

  Below the horizontal reinforcing member 30, a rail 32 extending in the circumferential direction along the side plate 4 is provided at a position offset by a predetermined dimension from the side plate 4 to the outside. The rail 32 is formed by connecting circular I-shaped steel divided into lengths that can be transported by human power to form an annular shape, and is a vertical rail support that is suspended vertically downward from the horizontal reinforcing member 30. It is suspended by a material 33. The upper end of the vertical rail support member 33 is connected to an oblique reinforcing member 34 that extends obliquely upward from the vertical rail support member 33 and is connected to the upper end of the outer support column 24o, whereby the rail 32 is reliably supported by the jack mount 21. The

  An appropriate number of lifting means 35 are slidably provided on the rail 32. As the lifting means 35, a power-driven type such as a winch or a hoist crane can be used in addition to a manual operation such as a chain block with a trolley or a lever hoist. The number of lifting means 35 may be an even number such as two or four when used in pairs, but is not limited thereto. The lifting means 35 is used when hanging the side plate cutting piece 4b in the dismantling operation described later or hanging the side plate piece 14b in the building operation described later. The installation height is set higher than the height of the first stage side plate portion 4a plus the minimum height of the lifting means 35 (upper and lower dimensions when the upper limit is lifted). It is good to make it lower than the height of the side plate portion 4a.

<Disassembly procedure>
Next, a procedure of a disassembly method for disassembling the existing tank 1 using the tank construction facility 20 will be described with reference to FIG. First, as shown to (A), the opening 5a (FIG. 3) for penetrating the inner support | pillar 24i is drilled in the predetermined position of the roof 5 of the existing tank 1, and the above-mentioned tank construction equipment 20 is installed. To do. That is, eight jack stands 21 having a height higher than that of the side plates 4 are arranged at predetermined intervals along the side plates 4, and the jacks 22 are installed on the connecting members 25 of the jack stands 21. In addition, the rail 32 is attached to the jack mount 21 so as to extend around the side plate 4, and the lifting means 35 is attached to the rail 32 so as to be movable.

Thereafter, the suspension member 23 is provided so as to be engageable with the jack base 21 and the jack 22 by the lower nut 28l or the upper nut 28u (both in FIG. 4), and connected to the lower end of the suspension member 23. 29 binds to the side plate portion 4a ₄ the uppermost by welding (FIG. 4). Here, it is assumed that the suspension member 23 is engaged with both the jack base 21 and the jack 22.

Next, as shown in FIG. 5B, all the suspension members 23 are engaged with the jacks 22 by the upper nuts 28u, a predetermined tension is applied to the suspension members 23 with the jacks 22, and then the lower portion The suspension member 23 is engaged with the jack mount 21 by the nut 28l, and the side plate 4 is suspended by the suspension member 23, that is, the load of the side plate 4 and the roof 5 is supported by the eight jack mounts 21, On the bottom plate 3, the lowermost side plate portion 4 a ₁ is removed. The side plate portion 4a ₁ is removed by cutting the side plate portion 4a ₁ into a side plate cut piece 4b of a desired size by opening a suspension hole with a gas cutter and temporarily suspending it with the lifting means 35. The piece 4b is lifted by the lifting means 35, moved along the rail 32, and carried to a predetermined carry-out position.

After completion removal of the lowermost plate portion 4a _1, as shown in FIG. 5 (C), all of the hanging member 23 to the jack 22 is contracted is engaged with the jack 22, the side plate portion 4a ₁ of the lowermost removal The made side plate 4 is lowered. Here, as shown in FIG. 6A, the upper nut 28u is first loosened (raised) to disengage from the jack 22, and the load on the side plate 4 is supported only by the lower nut 28l. And Next, as shown in (B), after extending the jack 22, the upper nut 28u is tightened (lowered) so that a load is applied to the upper nut 28u, and the lower nut 28l is loosened. In this state, the load of the side plate 4 is supported only by the upper nut 28u. In this state, as shown in (C), the hydraulic oil of the jack 22 is gradually removed, the jack 22 is contracted, and the side plate 4 is lowered by the jack stroke. After the jack 22 is contracted to the shortest dimension, the lower nut 28l is tightened (lowered) so that a load is applied to the lower nut 28l. Such a procedure by repeating, to lower the by the height of the side plate 4 of the plate portion 4a ₁ of the bottom was removed.

The suspension member 23 is joined by repeating the operation of removing the lowermost side plate portion 4a (4a ₂ , 4a ₃ ) of FIG. 5 (B) and the operation of lowering the side plate 4 of FIG. 5 (C) two more times. position without changing Sheng a, as shown in FIG. 5 (D), the existing tank is 3-stage plate portion 4a ₁ to 4A ₃ of the lower reaches only the side plate portion 4a ₄ and the roof 5 uppermost is removed 1 is placed on the bottom plate 3. Finally, the roof 5 and the uppermost side plate portion 4a ₄ are disassembled and removed on the bottom plate 3, and the dismantling of the existing tank 1 is completed with the bottom plate 3 left as shown in FIG. When the bottom plate 3 is also removed, each jack mount 21 is in a state in which the inner column 24i is placed on the remaining bottom plate 3, and therefore the lower column of the inner column 24i. By replacing the member 24a by removing the member 24a or the like, the bottom plate 3 can be removed and a new tank bottom plate can be laid.

<Construction procedure>
Next, referring to FIG. 7, a new tank 11 constituted by _four side plate portions 14 a (14 a ₁ , 14 a ₂ , 14 a ₃ , and 14 a _{4 in} order from the bottom) in which the side plate 14 is divided in the vertical direction. The procedure of the construction method for constructing the system using the tank construction facility 20 will be described. First, (A), the side plates piece 14b constituting the side plate portion 14a ₄ of the top with Agekasane means 35 and carried into a predetermined assembly position, and connected on the bottom plate 3 in the circumferential direction a cylindrical The uppermost side plate portion 14a ₄ is assembled. In addition, since the new tank 11 of this embodiment is provided with the roof 15, it is good to distribute the material of the roof 15 to an assembly position before carrying in the uppermost side plate piece 14b. As shown in FIG. 7 (B), after assembly of the uppermost plate portion 14a _4, integrally joined by assembling roof 15 at the top of the side plate portions 14a ₄ by the roof member that has been disposed. Also here, since the inner column 24i of the jack mount 21 interferes with the roof 5, the periphery of the inner column 24i is left as an opening 5a without joining the roof plate.

In the present embodiment, since the new tank 11 is constructed after the existing tank 1 is disassembled, the tank construction equipment 20 is left, but when constructing a new tank 11 newly, After laying the bottom plate 3, the tank construction facility 20 is installed in the same procedure as described with reference to FIG. In this case, since there is no existing tank 1, when installing the eight jack mounts 21 along the position where the side plate 14 is installed, in addition to the lifting scaffold installed close to the outer support column 24o, It is advisable to assemble the inner strut 24i by installing a scaffold or the like. The height of each column 24 is set higher than the height of the side plate 14 to be constructed, and the jack 22 is installed at a position higher than the upper end of the side plate 14 of each jack mount 21. The time for installing the tank construction facility 20 may be before assembly of the uppermost side plate portion 14a ₄ or after assembly.

After the construction of the uppermost side plate portion 14a ₄ and the roof 15, as shown in FIG. 7C, the suspension member 23 is engaged with the jack 22, and the connection hardware 29 (which is screwed to the lower end of the suspension member 23). 4) bind to the top of the side plate portion 14a ₄ on the bottom plate 3 by welding.

Thereafter, as shown in FIG. 7 (D), it is extended all the jacks 22 in a state of engaging the hanging member 23, raising the side plate portion 14a ₄ on the bottom plate 3 assembled. Here, the reverse procedure of the side plate lowering described with reference to FIG. 6, that is, the jack 22 is extended from the state of FIG. 6C to the state of FIG. In the procedure in which the jack 22 is contracted after the bolts are tightened to obtain the state shown in FIG. 6A, a plurality of operations for raising the load by the jack stroke while alternately transmitting loads to the upper nut 28u and the lower nut 28l by repeating times, raising the side plate portion 14a ₄ assembled by the height of the next stage of the side plate portion 14a _3.

Next, as shown in FIG. 7 (E), the hanging member 23 jacking frame 21 or the jack 22 is engaged with (both in this case), to support the load of the side plate portion 14a ₄ to the jacking frame 21, In the state where the raised side plate portion 14 a ₄ is suspended by the suspension member 23, the next side plate portion 14 a ₃ is assembled on the bottom plate 3 so as to be integrally joined to the upper side plate portion 14 a ₄ .

The operation of raising the side plate portions 4a (14a ₄ , 14a ₃ and 14a ₄ , 14a ₃ , 14a ₂ ) on the bottom plate 3 in FIG. 7D, and the next side plate on the bottom plate 3 in FIG. By repeating the operation of assembling the portion 4a (14a ₂ · 14a ₁ ) two more times, as shown in FIG. 7 (F), without changing the connecting position of the suspension member 23, the bottom plate portion 14a ₁ Assembly is complete. Incidentally, the side plate portion 14a ₁ of the lowest stage, also integrally joined to the bottom plate 3 by welding. After that, the tank construction facility 20 is disassembled, and the roof plate is welded to the place where the column 24i inside the jack mount 21 is penetrated to close the opening 5a, and the construction work of the new tank 11 is completed. In addition, what is necessary is just to carry out the inner side support | pillar 24i disassembled inside the new installation tank 11 from the manhole provided in the side plate 14 of the new installation tank 11. FIG.

All the jacks 22 are used when the side plates 4 and 14 are lowered or raised by disassembling the existing tank 1 or constructing the new tank 11 by using the tank construction facility 20 configured as described above. Therefore, the required number of jacks 22 can be reduced. In addition, the side plates 4 and 14 are suspended from above using the suspension member 23 to lift down and lift up, and the length of the suspension member 23 is engaged with the jack 22 in the uppermost side plate portion. 4a ₄ has a length that can be placed on the bottom plate 3 or a length that can be coupled to the uppermost side plate portion 14a ₄ placed on the bottom plate 3, so that the lift becomes large and the side plate 4 of the suspension member 23 is The coupling is only required once, and the number of locations where the temporary parts (connection hardware 29) are welded to the tank body is suppressed. In addition, since the jacks 22 are not replaced, lift-down and lift-up operations are easy.

  In this embodiment, since the rail 32 is provided around the side plate 4 and the lifting means 35 is movably provided on the rail 32, a suspension piece for temporary suspension such as a chain block is provided when the side plate cutting piece 4b is disassembled. There is no need, disassembling work is easy, and it is easy to carry out the disassembled side plate cutting pieces 4b. Further, it is easy to carry in and assemble the side plate piece 14b. Therefore, it is also suitable for a narrow site where heavy machinery cannot be installed.

  Further, in this embodiment, each jack base 21 has a pair of support columns 24 and is a cantilever type in which the jack 22 and the suspension member 23 are provided between the pair of support columns 24. Each member can be reduced in weight compared with the case. In addition, since the relatively heavy support columns 24 and rails 32 are divided, they can be transported and assembled by manpower, and are suitable for work in a narrow field where heavy machinery cannot be installed.

  This is the end of the description of specific embodiments, but the present invention is not limited to these embodiments. For example, in the above-described embodiment, the present invention is applied to the existing tank 1 and the new tank 11 having a fixed roof type conical roof. However, the present invention is applied to a floating roof type tank or a different type of fixed roof type tank such as a spherical roof. It is also possible. Moreover, in the said embodiment, although the roofs 5 and 15 are the self-supporting type supported only by the side plates 4 and 14, it is applicable also to the tank which has the roof support | pillar which supports the roofs 5 and 15 inside. In this case, if necessary, a jack pedestal 21 is provided so as to straddle the roof column, and the upper end of the roof column is suspended by a suspension member 23, or a jack facility as described in Patent Document 1 is provided. It is good to provide and support the lower part of the roof column. Moreover, when there is a roof support | pillar, conveyance of a roof material can also be made easier by utilizing this. In addition, the specific shape, arrangement, quantity, order of work procedures, and the like of each member can be changed as appropriate without departing from the spirit of the present invention. Moreover, not all the elements (steps) of the dismantling method of the existing tank 1 and the construction method of the new tank 11 according to the present invention shown in the above embodiment and the constituent elements of the tank construction facility 20 are not necessarily essential. Any selection can be made as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Existing tank 2 Bottom plate 3 Bottom plate 4 Side plate 4a Side plate part 4b Side plate cut piece 11 New tank 14 Side plate 14a Side plate part 14b Side plate piece 20 Tank construction equipment 21 Jack mount 22 Jack 23 Lifting material 32 Rail 35 Lifting means

Claims (3)

A method for disassembling the storage tank, comprising removing a storage tank having a bottom plate and a cylindrical side plate constructed on the bottom plate while dividing the side plate into a plurality of side plate parts in the vertical direction,
A step of a plurality of rack jack along the side plates and placed in a predetermined interval, placing the jack in a higher position than the upper end of the side plate of the frame for each jack having a height greater than the side plates,
Providing a rail supported by the plurality of jack mounts so as to extend around the side plate, and providing a lifting means movable along the rail;
A suspension member is provided so as to be engageable with the jack mount and the jack, and coupled to the uppermost side plate portion;
In a state where the side plate is suspended by the suspension material, removing the lowermost side plate portion on the bottom plate, and carrying out a piece of the removed side plate portion by the lifting means ;
Engaging the suspension material with the jack to contract the jack and lowering the side plate from which the lowermost side plate portion has been removed,
A method of disassembling a storage tank, wherein the step of removing the lowermost side plate portion and the step of lowering the side plate are repeated, and all the side plate portions are removed without changing the connecting position of the suspension members. A construction method of a storage tank comprising a bottom plate and a plurality of side plate parts divided in the vertical direction and having a cylindrical side plate constructed on the bottom plate,
The frame for a plurality of jacks having a height greater than the side plates to be constructed, and placed in a predetermined interval along a position of installing the side plate, in a higher position than the upper end of the side plate of the frame for each jack Installing a jack, and
Providing a rail supported by the plurality of jack mounts so as to extend around the side plate, and providing a lifting means movable along the rail;
Carrying a plurality of side plate pieces obtained by dividing the side plate portion in the circumferential direction by the lifting means;
Assembling the uppermost side plate portion on the bottom plate with the loaded side plate piece ;
A suspension member is provided so as to be engageable with the jack mount and the jack and coupled to a side plate portion on the bottom plate;
Engaging the jack with the jack and extending the jack to raise the side plate portion on the assembled bottom plate;
Assembling on the bottom plate so that the side plate portion of the next stage is integrally joined to the side plate portion of the upper stage by the loaded side plate piece in a state where the raised side plate portion is suspended by the suspension material,
The step of raising the side plate portion on the bottom plate and the step of assembling the next-stage side plate portion on the bottom plate are repeated, and the bottom-side side plate portion is assembled without changing the connecting position of the suspension material. How to build a tank. A facility for disassembling or constructing a storage tank comprising a bottom plate and a cylindrical side plate constructed on the bottom plate, the side plate being composed of a plurality of side plate parts divided in the vertical direction,
A plurality of jack mounts arranged at predetermined intervals along the side plate and having a height higher than the side plate;
A plurality of jacks installed on each jack mount at a position higher than the upper end of the side plate;
The has a bottom plate on the placed on top of the plate portion to allow lengths bond that, hanging member that is coupled to the side plate portion of the uppermost and is rotatable in engagement with the jacking frame and the jack and,
Rails supported by the plurality of jack mounts and extending around the side plates;
Demolition or equipment for the construction of storage tanks, characterized in that have a <br/> and lifting means provided movably in the rail.

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